Terence John Sabaka

Terence John Sabaka

  • RSCH AST, SOLID EARTH GEOPHYSICAL STD
  • 301.614.6493
  • NASA/GSFC
  • Mail Code: 61A
  • Greenbelt , MD 20771
  • Employer: NASA
  • Brief Bio

    Terence Sabaka has been working in geopotential research for over 31 years at GSFC.  This includes modeling the near-Earth magnetic field and producing a suite of models known as "Comprehensive Models" that have been of great use to the scientific community.  He has also included capabilities in the Geodetic Parameter Estimation (GEODYN) code and has provided guidance in general parameter estimation for Space Geodesy.  He is also developing algorithms to produce gridded Level-3 products for the GEDI mission.

    Research Interests

    Geopotential Field Theory

    Studying magnetic and gravity fields through measurements made by satellites and ground surveys.

    Inverse Theory

    Once measurements have been collected what is the best way to infer the states of geophysical parameters, such as spherical harmonic expansions of magnetic and gravity fields.  This includes accounting for noise in the system, which is comprised not only of a zero-mean random part, but also systematic bias.

    Current Projects

    Comprehensive Geomagnetic Field Modeling

    The theory behind Comprehensive Geomagnetic Field Modeling is to parameterize the major near-Earth magnetic field sources and subsequently co-estimate them so as to achieve optimal separation of sources.  This has been used to great success over the part two decades and has produced a suite of Comprehensive Models (CMs), which have been used extentsively by the community.  This algorithm is used to produce the primary line of Level-2 magnetic field products for the ESA Swarm mission.

    Level-3 Gridded Land Surface Metrics for the Global Ecosystem Dynamics Investigation (GEDI) Mission

    The Global Ecosystem Dynamics Investigation (GEDI) Mission will measure vegatation canopy heights at non-uniform postions.  In order to deliver values on a regular grid, this information will need to be interpolated.  Possible methods for doing this include using Restricted Maximum Likelihood (REML) to first estimate the deterministic and stochastic parts of the signal in the GEDI data followed by Bayesian Kriging (BK) to interpolate this information to the regular grid centers.  BK is able to incorporate uncertainties in the REML step in order to optimally interpolate the signal and provide realistic error estimates of the interpolates.

    Incorporation of Kalman Filtering/Smoothing into the Precise Orbit Determination and Geodetic Parameter Estimation (GEODYN) Program.

    The Precise Orbit Determination and Geodetic Parameter Estimation (GEODYN) Program currently assumes that the equations of motion are error-free.  However, many factors render this assumption invalid.  Therefore, a Kalman filtering/smoothing system is being developed for GEODYN in which process noise can be accounted for in the satellite dynamics leading to Dynamic Model Compensation via Gauss-Markov error processes.  This will also allow for dynamic error-covariance matrices to be produced that coincide with the orbits.

    Positions/Employment

    11/2016 - Present

    Research Geophysicist

    NASA, Geodesy and Geophysics Laboratory, Code 61A, Goddard Space Flight Center

    Carries out research in geopotential modeling of the Earth, Moon, and other planets.  Supports magnetic and geodetic missions.

    6/2009 - 11/2016

    Research Geophysicist

    NASA, Planetary Geodynamics Laboratory, Code 698, Goddard Space Flight Center

    Carries out research in geopotential modeling of the Earth, Moon, and other planets. Supports magnetic and geodetic missions.

    3/1986 - 6/2009

    Research Geophysicist

    Raytheon Corporation, Goddard Space Flight Center

    Carries out research in geopotential modeling of the Earth, Moon, and other planets. Supports magnetic and geodetic missions.

    Education

    1983 - BS (summa cum laude, geology) University of Akron
    1986 - MS (geophysics) University of Akron
    2003 - MS (applied mathematics) University of Maryland Baltimore County

    Publications

    Refereed

    Grayver, A. V., F. D. Munch, A. V. Kuvshinov, et al. A. Khan, T. J. Sabaka, and L. Tøffner-Clausen. 2017. "Joint inversion of satellite-detected tidal and magnetospheric signals constrains electrical conductivity and water content of the upper mantle and transition zone." Geophysical Research Letters, 44 (12): 6074-6081 [10.1002/2017gl073446]

    Goossens, S. J., T. J. Sabaka, A. Genova, et al. E. M. Mazarico, J. B. Nicholas, and G. A. Neumann. 2017. "Evidence for a Low Bulk Crustal Density for Mars from Gravity and Topography." Geophysical Research Letters, 44 (15): 7686–7694 [10.1002/2017GL074172]

    Mazarico, E. M., D. D. Rowlands, T. J. Sabaka, et al. K. M. Getzandanner, D. P. Rubincam, J. B. Nicholas, and M. C. Moreau. 2017. "Recovery of Bennu's Orientation for the OSIRIS-REx Mission: Implications for the Spin State Accuracy and Geolocation Errors." Journal of Geodesy, 91 (10): 1141-1161 [Full Text (Link)] [10.1007/s00190-017-1058-2]

    Sabaka, T. J., R. H. Tyler, and N. Olsen. 2016. "Extracting ocean-generated tidal magnetic signals from Swarm data through satellite gradiometry." Geophysical Research Letters, 43 (7): 3237-3245 [10.1002/2016gl068180]

    Grayver, A. V., N. R. Schnepf, A. V. Kuvshinov, et al. T. J. Sabaka, C. Manoj, and N. Olsen. 2016. "Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary." Science Advances, 2 (9): e1600798-e1600798 [10.1126/sciadv.1600798]

    Sabaka, T. J., N. Olsen, R. H. Tyler, and A. Kuvshinov. 2015. "CM5, a pre-Swarm comprehensive geomagnetic field model derived from over 12 yr of CHAMP, Ørsted, SAC-C and observatory data ." Geophys. J. Int., 200 (3): 1596-1626 [10.1093/gji/ggu493]

    Schnepf, N. R., A. Kuvshinov, and T. J. Sabaka. 2015. "Can we probe the conductivity of the lithosphere and upper mantle using satellite tidal magnetic signals?" Geophysical Research Letters, 42 (9): 3233–3239 [10.1002/2015GL063540]

    Thébault, E., C. C. Finlay, C. D. Beggan, et al. P. Alken, J. Aubert, O. Barrois, F. Bertrand, T. Bondar, A. Boness, L. Brocco, E. Canet, A. Chambodut, A. Chulliat, P. Coïsson, F. Civet, A. Du, A. Fournier, I. Fratter, N. Gillet, B. Hamilton, M. Hamoudi, G. Hulot, T. Jager, M. Korte, W. Kuang, X. Lalanne, B. Langlais, J.-M. Léger, V. Lesur, F. J. Lowes, S. Macmillan, M. Mandea, C. Manoj, S. Maus, N. Olsen, V. Petrov, V. Ridley, M. Rother, T. J. Sabaka, D. Saturnino, R. Schachtschneider, O. Sirol, A. Tangborn, A. Thomson, L. Tøffner-Clausen, P. Vigneron, I. Wardinski, and T. Zvereva. 2015. "International Geomagnetic Reference Field: the 12th generation." Earth Planet Sp, 67 (1): 79 [10.1186/s40623-015-0228-9]

    Neumann, G. A., M. T. Zuber, M. A. Wieczorek, et al. J. W. Head, D. M. Baker, S. C. Solomon, D. E. Smith, F. G. Lemoine, E. Mazarico, T. J. Sabaka, S. J. Goossens, H. J. Melosh, R. J. Phillips, S. W. Asmar, A. S. Konopliv, J. G. Williams, M. M. Sori, J. M. Soderblom, K. Miljkovic, J. C. Andrews-Hanna, F. Nimmo, and W. S. Kiefer. 2015. "Lunar impact basins revealed by Gravity Recovery and Interior Laboratory measurements." Science Advances, 1 (9): e1500852-e1500852 [10.1126/sciadv.1500852]

    Lemoine, F. G., S. J. Goossens, T. J. Sabaka, et al. J. B. Nicholas, E. M. Mazarico, D. D. Rowlands, B. D. Loomis, D. S. Chinn, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2014. "GRGM900C: A degree-900 lunar gravity model from GRAIL primary and extended mission data." Geophys. Res. Lett., 41 (10): 3382-3389 [10.1002/2014GL060027]

    Goossens, S. J., T. J. Sabaka, J. B. Nicholas, et al. F. G. Lemoine, D. D. Rowlands, E. M. Mazarico, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2014. "High-resolution local gravity model of the south pole of the Moon from GRAIL extended mission data." Geophys. Res. Lett., 41 (10): 3367-3374 [10.1002/2014GL060178]

    Luthcke, S. B., D. Rowlands, T. Sabaka, et al. B. Loomis, M. Horwath, and A. Arendt. 2014. "Gravimetry measurements from space." Remote Sensing of the Cryosphere, 231-247 [10.1002/9781118368909.ch10]

    Luthcke, S. B., T. J. Sabaka, B. D. Loomis, et al. A. A. Arendt, J. J. McCarthy, and J. B. Camp. 2013. "Antarctica, Greenland and Gulf of Alaska land ice evolution from an iterated GRACE global mascon solution." Journal of Glaciology, 216: 613-631 [10.3189/2013JoG12J147]

    Lemoine, F. G., S. J. Goossens, T. J. Sabaka, et al. J. B. Nicholas, E. M. Mazarico, D. D. Rowlands, B. D. Loomis, D. S. Chinn, D. S. Caprette, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2013. "High-degree gravity models from GRAIL primary mission data." J. Geophys. Res.-Planets, 118: 1676-1698 [10.1002/jgre.20118]

    Sabaka, T. J., L. Toffner-Clausen, and N. Olsen. 2013. "Use of the Comprehensive Inversion method for Swarm satellite data analysis." Earth Planets and Space, 65 (11): 1201-1222 [10.5047/eps.2013.09.007]

    Sabaka, T. J., D. D. Rowlands, S. B. Luthcke, and J. P. Boy. 2010. "Improving global mass flux solutions from Gravity Recovery and Climate Experiment (GRACE) through forward modeling and continuous time correlation." J. Geophys. Res., 115 (B11): B11403 [10.1029/2010JB007533]

    Sabaka, T. J., T. Handbook of Geomathematics, T. Handbook of Geomathematics, T. Handbook of Geomathematics, and 0. Pages 504-538. 2010. "Mathematical properties relevant to geomagnetic field modeling."

    Thebault, E., M. E. Purucker, K. A. Whaler, B. Langlais, and T. J. Sabaka. 2010. "The magnetic field of the Earth's lithosphere." Space Science Reviews, 155 (1-4): 95-127 [10.1007/s11214-010-9667-6]

    Olsen, N., M. Mandea, T. J. Sabaka, and L. Toffner-Clausen. 2010. "The CHAOS-3 geomagnetic field model and candidates for the 11th generation IGRF." Earth Planets and Space, 62 (10): 719-727 [10.5047/eps.2010.07.003]

    Olsen, N., G. Hulot, and T. J. Sabaka. 2010. "Measuring the Earth's magnetic field from space: Concepts of past, present and future missions." Space Science Reviews, 155 (1-4): 65-93 [10.1007/s11214-010-9676-5]

    Rowlands, D. D., S. B. Luthcke, J. McCarthy, et al. S. Klosko, D. S. Chinn, F. G. Lemoine, J.-P. C. Boy, and T. J. Sabaka. 2010. "Global mass flux solutions from GRACE: A comparison of parameter estimation strategies—Mass concentrations versus Stokes coefficients." J. Geophys. Res. Solid Earth, 115 (B1): [Full Text (Link)] [10.1029/2009JB006546]

    Finlay, C. C., S. Maus, C. D. Beggan, et al. T. N. Bondar, A. Chambodut, T. A. Chernova, A. Chulliat, V. P. Golovkov, B. Hamilton, M. Hamoudi, R. Holme, G. Hulot, W. Kuang, B. Langlais, V. Lesur, F. J. Lowes, H. Luhr, S. Macmillan, M. Mandea, S. McLean, C. Manoj, M. Menvielle, I. Michaelis, N. Olsen, J. Rauberg, M. Rother, T. J. Sabaka, A. Tangborn, L. Tffner-Clausen, E. Thebault, A. W. Thomson, I. Wardinski, and T. I. Zvereva. 2010. "International Geomagnetic Reference Field: the eleventh generation." Geophysical Journal International, 183 (3): 1216-1230 [10.1111/j.1365-246X.2010.04804.x]

    Purucker, M. E., T. J. Sabaka, S. Solomon, et al. B. Anderson, H. Korth, M. T. Zuber, and G. A. Neumann. 2009. "Mercury's internal magnetic field: Constraints on large- and small-scale fields of crustal origin ." Earth and Planetary Science Letters , 285 (3-4): 340-346 [ 10.1016/j.epsl.2008.12.017]

    Olsen, N., M. Mandea, T. J. Sabaka, and L. Toffner-Clausen. 2009. "CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data ." Geophysical Journal International , 179 (3): 1477-1487.

    Kuang, W., A. Tangborn, Z. Wei, and T. J. Sabaka. 2009. "Constraining a numerical geodynamo model with 100 years of surface observations." Geophysical Journal International, 179 (3): 1458-1468 [10.1111/j.1365-246X.2009.04376.x]

    Olsen, N., M. Mandea, T. J. Sabaka, and L. Toffner-Clausen. 2009. "CHAOS-2, a geomagnetic field model derived from one decade of continuous satellite data." Geophysical Journal International, 179 (3): 1477-1487 [10.1111/j.1365-246x.2009.04386.x]

    Nicholas, J. B., M. E. Purucker, and T. J. Sabaka. 2007. "Age spot or youthful marking: Origin of Reiner Gamma." Geophysical Research Letters, 34 (2): L02205 [10.1029/2006gl027794]

    Kuvshinov, A., C. Manoj, N. Olsen, and T. Sabaka. 2007. "On induction effects of geomagnetic daily variations from equatorial electrojet and solar quiet sources at low and middle latitudes." Journal of Geophysical Research, 112 (B10): B10102 [10.1029/2007jb004955]

    Purucker, M., T. Sabaka, G. Le, et al. J. A. Slavin, R. J. Strangeway, and C. Busby. 2007. "Magnetic field gradients from the ST-5 constellation: Improving magnetic and thermal models of the lithosphere." Geophys Res. Lett, 34 (24): L24306 [ 10.1029/2007GL031739]

    Olsen, N., R. Haagmans, T. J. Sabaka, et al. A. Kuvshinov, S. Maus, M. E. Purucker, M. Rother, V. Lesur, and M. Mandea. 2006. "The Swarm End-to-End mission simulator study: A demonstration of separating the various contributions to Earth’s magnetic field using synthetic data." Earth, Planets and Space, 58 (4): 359-370 [10.1186/bf03351934]

    Kuvshinov, A., T. Sabaka, and N. Olsen. 2006. "3-D electromagnetic induction studies using the Swarm constellation: Mapping conductivity anomalies in the Earth’s mantle." Earth, Planets and Space, 58 (4): 417-427 [10.1186/bf03351938]

    Sabaka, T. J., and N. Olsen. 2006. "Enhancing comprehensive inversions using the Swarm constellation." Earth Planets and Space, 58 (4): 371–395 [Full Text (Link)] [10.1186/BF03351935]

    Olsen, N., H. Lühr, T. J. Sabaka, et al. M. Mandea, M. Rother, L. Tøffner-Clausen, and S. Choi. 2006. "CHAOS-a model of the Earth's magnetic field derived from CHAMP, Ørsted, and SAC-C magnetic satellite data." Geophysical Journal International, 166 (1): 67-75 [10.1111/j.1365-246x.2006.02959.x]

    Nazarova, K. A., Y. Tsvetkov, J. Heirtzler, and T. Sabaka. 2005. "Balloon Geomagnetic Survey at Stratospheric Altitudes." Earth Observation with CHAMP, Berlin, Germany: 273-278, ISBN: 3-540-22804-7. [10.1007/3-540-26800-6_43]

    Olsen, N., T. Sabaka, and F. Lowes. 2005. "New Parameterization of External and Induced Fields in Geomagnetic Field Modeling, and a Candidate Model for IGRF 2005." Earth Planets Space, 57 (12): 1141-1149 [10.1186/BF03351897]

    Olsen, N., F. Lowes, and T. Sabaka. 2005. "Ionospheric and Induced Field Leakage in Geomagnetic Field Models, and Derivation of Candidate Models for DGRF 1995 and DGRF 2000." Earth Planets and Space, 57 (12): 1191-1196 [Full Text (Link)] [10.1186/BF03351903]

    Sabaka, T. J., N. Olsen, and M. E. Purucker. 2004. "Extending comprehensive models of the Earth's magnetic field with Ørsted and CHAMP data." Geophysical Journal International, 159 (2): 521-547 [10.1111/j.1365-246x.2004.02421.x]

    Ravat, D., K. A. Whaler, M. Pilkington, T. Sabaka, and M. Purucker. 2002. "Compatibility of high-altitude aeromagnetic and satellite-altitude magnetic anomalies over Canada." GEOPHYSICS, 67 (2): 546-554 [10.1190/1.1468615]

    Voorhies, C. V., T. J. Sabaka, and M. Purucker. 2002. "On magnetic spectra of Earth and Mars." J. Geophys. Res.-Planets, 107 (E6): 5034 [ 10.1029/2001/JE001534]

    Sabaka, T. J., N. Olsen, and R. A. Langel. 2002. "A comprehensive model of the quiet-time, near-Earth magnetic field: Phase 3." Geophysical Journal International, 151 (1): 32-68 [10.1046/j.1365-246X.2002.01774.x]

    Merayo, J., F. Primdahl, P. Brauer, et al. T. Risbo, N. Olsen, and T. Sabaka. 2001. "The orthogonalization of magnetic systems." Sensors and Actuators A: Physical, 89 (3): 185-196 [10.1016/s0924-4247(00)00515-x]

    Olsen, N., T. J. Sabaka, and L. Toffner-Clausen. 2000. " Determination of the IGRF 2000 model." Earth Planets and Space, 52 (12): 1175-1182 [Full Text (Link)] [10.1186/BF03352349]

    Purucker, M., D. Ravat, H. Frey, et al. C. Voorhies, T. Sabaka, and M. Acuna. 2000. "An altitude-normalized magnetic map of Mars and its interpretation." Geophys. Res. Lett., 27 (16): 2449-2452 [10.1029/2000GL000072]

    Olsen, N., R. Holme, G. Hulot, et al. T. Sabaka, T. Neubert, L. Tøffner-Clausen, F. Primdahl, J. Jørgensen, J.-M. Léger, D. Barraclough, J. Bloxham, J. Cain, C. Constable, V. Golovkov, A. Jackson, P. Kotzé, B. Langlais, S. Macmillan, M. Mandea, J. Merayo, L. Newitt, M. Purucker, T. Risbo, M. Stampe, A. Thomson, and C. Voorhies. 2000. "Ørsted Initial Field Model." Geophysical Research Letters, 27 (22): 3607-3610 [10.1029/2000gl011930]

    Sabaka, T. J., R. A. Langel, R. T. Baldwin, and J. A. Conrad. 1997. "The geomagnetic field 1900-1995, including the large-scale field from magnetospheric sources, and the NASA candidate models for the 1995 revision of the IGRF." Journal of Geomagnetism and Geoelectricity, 49 (2-3): 157-206 [Full Text (Link)] [10.5636/jgg.49.157]

    Langel, R. A., J. A. Conrad, and T. J. Sabaka. 1997. "Adjustment of UARS, POGS, and DE-1 satellite magnetic field data for modeling of Earth's main field." Journal of Geomagnetism and Geoelectricity, 49 (2-3): 393-415 [Full Text (Link)]

    Sabaka, T. J., R. A. Langel, R. T. Baldwin, and J. A. Conrad. 1997. "The geomagnetic field 1900-1995, including the large-scale field from magnetospheric sources, and the NASA candidate models for the 1995 revision of the IGRF." Journal of geomagnetism and geoelectricity, 49 (2-3): 157-206 [Full Text (Link)] [10.5636/jgg.49.157]

    Purucker, M. E., T. J. Sabaka, R. A. Langel, and N. Olsen. 1997. "The missing dimension in Magsat and POGO anomaly studies." Geophysical Research Letters, 24 (22): 2909-2912 [10.1029/97gl52978]

    Purucker, M., T. Sabaka, and R. Langel. 1996. "Conjugate Gradient Analysis: A New Tool For Studying Satellite Magnetic Data Sets." Geophysical Research Letters, 23 (5): 507-510 [Full Text (Link)] [10.1029/96GL00388]

    Barton, C., R. Baldwin, D. Barraclough, et al. S. Bushati, M. Chiappini, Y. Cohen, R. Coleman, G. Hulot, P. Kotzé, V. Golovkov, A. Jackson, R. Langel, F. Lowes, D. McKnight, S. Macmillan, L. Newitt, N. Peddie, J. Quinn, and T. Sabaka. 1996. "International Geomagnetic Reference Field, 1995 revision Presented by IAGA Division V, Working Group 8." Physics of the Earth and Planetary Interiors, 97 (1-4): 23-26 [10.1016/0031-9201(96)03139-1]

    Langel, R., T. Sabaka, R. Baldwin, and J. Conrad. 1996. "The near-Earth magnetic field from magnetospheric and quiet-day ionospheric sources and how it is modeled." Physics of the Earth and Planetary Interiors, 98 (3-4): 235-267 [10.1016/s0031-9201(96)03190-1]

    Langel, R. A., T. J. Sabaka, and R. T. Baldwin. 1992. "The Geomagnetic Field: 1970-1990 and the NASA Candidate Models for DGRF1985 and IGRF1990.." Journal of geomagnetism and geoelectricity, 44 (9): 745-767 [10.5636/jgg.44.745]

    Langel, R. A., R. H. Estes, and T. J. Sabaka. 1989. "Uncertainty estimates in geomagnetic field modeling." Journal of Geophysical Research, 94 (B9): 12281 [10.1029/jb094ib09p12281]

    Langel, R. A., D. R. Barraclough, D. J. Kerridge, et al. V. P. Golovkov, T. J. Sabaka, and R. H. Estes. 1988. "Definitive IGRF models for 1945, 1950, 1955, and 1960.." Journal of geomagnetism and geoelectricity, 40 (6): 645-702 [10.5636/jgg.40.645]

    Non-Refereed

    Mazarico, E. M., F. G. Lemoine, S. J. Goossens, et al. T. J. Sabaka, J. B. Nicholas, D. D. Rowlands, G. A. Neumann, M. H. Torrence, D. E. Smith, and M. T. Zuber. 2013. "Improved precision orbit determination of lunar orbiters from GRAIL-derived lunar gravity models." Spaceflight Mechanics 2013 (AAS/AIAA Spaceflight Mechanics Meeting, Feb. 10-14, 2013, Kauai, Hawaii), Advances in the Astronautical Sciences 148, Part II: San Diego, California, U.S.A.: 1125-1141.

    Lemoine, F. G., S. J. Goossens, T. J. Sabaka, et al. J. B. Nicholas, E. M. Mazarico, D. D. Rowlands, B. D. Loomis, D. S. Chinn, D. Caprette, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2013. "Modeling and precise orbit determination in suport of gravity model development for the GRAIL mission." Spaceflight Mechanics 2013 (AAS/AIAA Spaceflight Mechanics Meeting, Feb. 10-14, 2013, Kauai, Hawaii), Advances in the Astronautical Sciences 148, Part II: San Diego, California, U.S.A.: 1111-1123.

    Olsen, N., G. Hulot, and T. J. Sabaka. 2010. "Sources of the geomagnetic field and the modern data that enable their investigation." The Handbook of Geomathematics

    Langel, R. A., T. J. Sabaka, and R. T. Baldwin. 1991. "Geomagnetic model investigations for 1980 - 1989: A model for strategic defense initiative particle beam experiments and a study in the effects of data types and observatory bias solutions." NASA-TM-104541 Greenbelt, Maryland, U.S.A.: [Full Text (Link)]

    Langel, R. A., T. J. Sabaka, and R. T. Baldwin. 1991. "An initial analysis of the data from the Polar Orbiting Geophysical (POGS) Satellite." NASA-TM-104551 Greenbelt, Maryland, U.S.A.: [Full Text (Link)]

    Langel, R. A., and T. J. Sabaka. 1990. "Processing of DMSP magnetic data: Handbook of programs, tapes, and datasets." NASA-TM-100757 Greenbelt, Maryland, U.S.A.: [Full Text (Link)]

    Ridgeway, J. R., T. J. Sabaka, and D. S. Chinn. 1989. "Processing of DMSP magnetic data and its use in geomagnetic field modeling." NASA-TM-100750 Greenbelt, Maryland, U.S.A.: [Full Text (Link)]

    Brief Bio

    Terence Sabaka has been working in geopotential research for over 31 years at GSFC.  This includes modeling the near-Earth magnetic field and producing a suite of models known as "Comprehensive Models" that have been of great use to the scientific community.  He has also included capabilities in the Geodetic Parameter Estimation (GEODYN) code and has provided guidance in general parameter estimation for Space Geodesy.  He is also developing algorithms to produce gridded Level-3 products for the GEDI mission.

    Publications

    Refereed

    Grayver, A. V., F. D. Munch, A. V. Kuvshinov, et al. A. Khan, T. J. Sabaka, and L. Tøffner-Clausen. 2017. "Joint inversion of satellite-detected tidal and magnetospheric signals constrains electrical conductivity and water content of the upper mantle and transition zone." Geophysical Research Letters 44 (12): 6074-6081 [10.1002/2017gl073446]

    Goossens, S. J., T. J. Sabaka, A. Genova, et al. E. M. Mazarico, J. B. Nicholas, and G. A. Neumann. 2017. "Evidence for a Low Bulk Crustal Density for Mars from Gravity and Topography." Geophysical Research Letters 44 (15): 7686–7694 [10.1002/2017GL074172]

    Mazarico, E. M., D. D. Rowlands, T. J. Sabaka, et al. K. M. Getzandanner, D. P. Rubincam, J. B. Nicholas, and M. C. Moreau. 2017. "Recovery of Bennu's Orientation for the OSIRIS-REx Mission: Implications for the Spin State Accuracy and Geolocation Errors." Journal of Geodesy 91 (10): 1141-1161 [Full Text (Link)] [10.1007/s00190-017-1058-2]

    Sabaka, T. J., R. H. Tyler, and N. Olsen. 2016. "Extracting ocean-generated tidal magnetic signals from Swarm data through satellite gradiometry." Geophysical Research Letters 43 (7): 3237-3245 [10.1002/2016gl068180]

    Grayver, A. V., N. R. Schnepf, A. V. Kuvshinov, et al. T. J. Sabaka, C. Manoj, and N. Olsen. 2016. "Satellite tidal magnetic signals constrain oceanic lithosphere-asthenosphere boundary." Science Advances 2 (9): e1600798-e1600798 [10.1126/sciadv.1600798]

    Sabaka, T. J., N. Olsen, R. H. Tyler, and A. Kuvshinov. 2015. "CM5, a pre-Swarm comprehensive geomagnetic field model derived from over 12 yr of CHAMP, Ørsted, SAC-C and observatory data ." Geophys. J. Int. 200 (3): 1596-1626 [10.1093/gji/ggu493]

    Schnepf, N. R., A. Kuvshinov, and T. J. Sabaka. 2015. "Can we probe the conductivity of the lithosphere and upper mantle using satellite tidal magnetic signals?" Geophysical Research Letters 42 (9): 3233–3239 [10.1002/2015GL063540]

    Thébault, E., C. C. Finlay, C. D. Beggan, et al. P. Alken, J. Aubert, O. Barrois, F. Bertrand, T. Bondar, A. Boness, L. Brocco, E. Canet, A. Chambodut, A. Chulliat, P. Coïsson, F. Civet, A. Du, A. Fournier, I. Fratter, N. Gillet, B. Hamilton, M. Hamoudi, G. Hulot, T. Jager, M. Korte, W. Kuang, X. Lalanne, B. Langlais, J.-M. Léger, V. Lesur, F. J. Lowes, S. Macmillan, M. Mandea, C. Manoj, S. Maus, N. Olsen, V. Petrov, V. Ridley, M. Rother, T. J. Sabaka, D. Saturnino, R. Schachtschneider, O. Sirol, A. Tangborn, A. Thomson, L. Tøffner-Clausen, P. Vigneron, I. Wardinski, and T. Zvereva. 2015. "International Geomagnetic Reference Field: the 12th generation." Earth Planet Sp 67 (1): 79 [10.1186/s40623-015-0228-9]

    Neumann, G. A., M. T. Zuber, M. A. Wieczorek, et al. J. W. Head, D. M. Baker, S. C. Solomon, D. E. Smith, F. G. Lemoine, E. Mazarico, T. J. Sabaka, S. J. Goossens, H. J. Melosh, R. J. Phillips, S. W. Asmar, A. S. Konopliv, J. G. Williams, M. M. Sori, J. M. Soderblom, K. Miljkovic, J. C. Andrews-Hanna, F. Nimmo, and W. S. Kiefer. 2015. "Lunar impact basins revealed by Gravity Recovery and Interior Laboratory measurements." Science Advances 1 (9): e1500852-e1500852 [10.1126/sciadv.1500852]

    Lemoine, F. G., S. J. Goossens, T. J. Sabaka, et al. J. B. Nicholas, E. M. Mazarico, D. D. Rowlands, B. D. Loomis, D. S. Chinn, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2014. "GRGM900C: A degree-900 lunar gravity model from GRAIL primary and extended mission data." Geophys. Res. Lett. 41 (10): 3382-3389 [10.1002/2014GL060027]

    Goossens, S. J., T. J. Sabaka, J. B. Nicholas, et al. F. G. Lemoine, D. D. Rowlands, E. M. Mazarico, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2014. "High-resolution local gravity model of the south pole of the Moon from GRAIL extended mission data." Geophys. Res. Lett. 41 (10): 3367-3374 [10.1002/2014GL060178]

    Luthcke, S. B., D. Rowlands, T. Sabaka, et al. B. Loomis, M. Horwath, and A. Arendt. 2014. "Gravimetry measurements from space." Remote Sensing of the Cryosphere 231-247 [10.1002/9781118368909.ch10]

    Luthcke, S. B., T. J. Sabaka, B. D. Loomis, et al. A. A. Arendt, J. J. McCarthy, and J. B. Camp. 2013. "Antarctica, Greenland and Gulf of Alaska land ice evolution from an iterated GRACE global mascon solution." Journal of Glaciology 216 613-631 [10.3189/2013JoG12J147]

    Lemoine, F. G., S. J. Goossens, T. J. Sabaka, et al. J. B. Nicholas, E. M. Mazarico, D. D. Rowlands, B. D. Loomis, D. S. Chinn, D. S. Caprette, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2013. "High-degree gravity models from GRAIL primary mission data." J. Geophys. Res.-Planets 118 1676-1698 [10.1002/jgre.20118]

    Sabaka, T. J., L. Toffner-Clausen, and N. Olsen. 2013. "Use of the Comprehensive Inversion method for Swarm satellite data analysis." Earth Planets and Space 65 (11): 1201-1222 [10.5047/eps.2013.09.007]

    Sabaka, T. J., D. D. Rowlands, S. B. Luthcke, and J. P. Boy. 2010. "Improving global mass flux solutions from Gravity Recovery and Climate Experiment (GRACE) through forward modeling and continuous time correlation." J. Geophys. Res. 115 (B11): B11403 [10.1029/2010JB007533]

    Sabaka, T. J., T. Handbook of Geomathematics, T. Handbook of Geomathematics, T. Handbook of Geomathematics, and 0. Pages 504-538. 2010. "Mathematical properties relevant to geomagnetic field modeling."

    Thebault, E., M. E. Purucker, K. A. Whaler, B. Langlais, and T. J. Sabaka. 2010. "The magnetic field of the Earth's lithosphere." Space Science Reviews 155 (1-4): 95-127 [10.1007/s11214-010-9667-6]

    Olsen, N., M. Mandea, T. J. Sabaka, and L. Toffner-Clausen. 2010. "The CHAOS-3 geomagnetic field model and candidates for the 11th generation IGRF." Earth Planets and Space 62 (10): 719-727 [10.5047/eps.2010.07.003]

    Olsen, N., G. Hulot, and T. J. Sabaka. 2010. "Measuring the Earth's magnetic field from space: Concepts of past, present and future missions." Space Science Reviews 155 (1-4): 65-93 [10.1007/s11214-010-9676-5]

    Rowlands, D. D., S. B. Luthcke, J. McCarthy, et al. S. Klosko, D. S. Chinn, F. G. Lemoine, J.-P. C. Boy, and T. J. Sabaka. 2010. "Global mass flux solutions from GRACE: A comparison of parameter estimation strategies—Mass concentrations versus Stokes coefficients." J. Geophys. Res. Solid Earth 115 (B1): [Full Text (Link)] [10.1029/2009JB006546]

    Finlay, C. C., S. Maus, C. D. Beggan, et al. T. N. Bondar, A. Chambodut, T. A. Chernova, A. Chulliat, V. P. Golovkov, B. Hamilton, M. Hamoudi, R. Holme, G. Hulot, W. Kuang, B. Langlais, V. Lesur, F. J. Lowes, H. Luhr, S. Macmillan, M. Mandea, S. McLean, C. Manoj, M. Menvielle, I. Michaelis, N. Olsen, J. Rauberg, M. Rother, T. J. Sabaka, A. Tangborn, L. Tffner-Clausen, E. Thebault, A. W. Thomson, I. Wardinski, and T. I. Zvereva. 2010. "International Geomagnetic Reference Field: the eleventh generation." Geophysical Journal International 183 (3): 1216-1230 [10.1111/j.1365-246X.2010.04804.x]

    Purucker, M. E., T. J. Sabaka, S. Solomon, et al. B. Anderson, H. Korth, M. T. Zuber, and G. A. Neumann. 2009. "Mercury's internal magnetic field: Constraints on large- and small-scale fields of crustal origin ." Earth and Planetary Science Letters 285 (3-4): 340-346 [ 10.1016/j.epsl.2008.12.017]

    Olsen, N., M. Mandea, T. J. Sabaka, and L. Toffner-Clausen. 2009. "CHAOS-2-a geomagnetic field model derived from one decade of continuous satellite data ." Geophysical Journal International 179 (3): 1477-1487

    Kuang, W., A. Tangborn, Z. Wei, and T. J. Sabaka. 2009. "Constraining a numerical geodynamo model with 100 years of surface observations." Geophysical Journal International 179 (3): 1458-1468 [10.1111/j.1365-246X.2009.04376.x]

    Olsen, N., M. Mandea, T. J. Sabaka, and L. Toffner-Clausen. 2009. "CHAOS-2, a geomagnetic field model derived from one decade of continuous satellite data." Geophysical Journal International 179 (3): 1477-1487 [10.1111/j.1365-246x.2009.04386.x]

    Nicholas, J. B., M. E. Purucker, and T. J. Sabaka. 2007. "Age spot or youthful marking: Origin of Reiner Gamma." Geophysical Research Letters 34 (2): L02205 [10.1029/2006gl027794]

    Kuvshinov, A., C. Manoj, N. Olsen, and T. Sabaka. 2007. "On induction effects of geomagnetic daily variations from equatorial electrojet and solar quiet sources at low and middle latitudes." Journal of Geophysical Research 112 (B10): B10102 [10.1029/2007jb004955]

    Purucker, M., T. Sabaka, G. Le, et al. J. A. Slavin, R. J. Strangeway, and C. Busby. 2007. "Magnetic field gradients from the ST-5 constellation: Improving magnetic and thermal models of the lithosphere." Geophys Res. Lett 34 (24): L24306 [ 10.1029/2007GL031739]

    Olsen, N., R. Haagmans, T. J. Sabaka, et al. A. Kuvshinov, S. Maus, M. E. Purucker, M. Rother, V. Lesur, and M. Mandea. 2006. "The Swarm End-to-End mission simulator study: A demonstration of separating the various contributions to Earth’s magnetic field using synthetic data." Earth, Planets and Space 58 (4): 359-370 [10.1186/bf03351934]

    Kuvshinov, A., T. Sabaka, and N. Olsen. 2006. "3-D electromagnetic induction studies using the Swarm constellation: Mapping conductivity anomalies in the Earth’s mantle." Earth, Planets and Space 58 (4): 417-427 [10.1186/bf03351938]

    Sabaka, T. J., and N. Olsen. 2006. "Enhancing comprehensive inversions using the Swarm constellation." Earth Planets and Space 58 (4): 371–395 [Full Text (Link)] [10.1186/BF03351935]

    Olsen, N., H. Lühr, T. J. Sabaka, et al. M. Mandea, M. Rother, L. Tøffner-Clausen, and S. Choi. 2006. "CHAOS-a model of the Earth's magnetic field derived from CHAMP, Ørsted, and SAC-C magnetic satellite data." Geophysical Journal International 166 (1): 67-75 [10.1111/j.1365-246x.2006.02959.x]

    Nazarova, K. A., Y. Tsvetkov, J. Heirtzler, and T. Sabaka. 2005. "Balloon Geomagnetic Survey at Stratospheric Altitudes." Earth Observation with CHAMP 273-278 [10.1007/3-540-26800-6_43]

    Olsen, N., T. Sabaka, and F. Lowes. 2005. "New Parameterization of External and Induced Fields in Geomagnetic Field Modeling, and a Candidate Model for IGRF 2005." Earth Planets Space 57 (12): 1141-1149 [10.1186/BF03351897]

    Olsen, N., F. Lowes, and T. Sabaka. 2005. "Ionospheric and Induced Field Leakage in Geomagnetic Field Models, and Derivation of Candidate Models for DGRF 1995 and DGRF 2000." Earth Planets and Space 57 (12): 1191-1196 [Full Text (Link)] [10.1186/BF03351903]

    Sabaka, T. J., N. Olsen, and M. E. Purucker. 2004. "Extending comprehensive models of the Earth's magnetic field with Ørsted and CHAMP data." Geophysical Journal International 159 (2): 521-547 [10.1111/j.1365-246x.2004.02421.x]

    Ravat, D., K. A. Whaler, M. Pilkington, T. Sabaka, and M. Purucker. 2002. "Compatibility of high-altitude aeromagnetic and satellite-altitude magnetic anomalies over Canada." GEOPHYSICS 67 (2): 546-554 [10.1190/1.1468615]

    Voorhies, C. V., T. J. Sabaka, and M. Purucker. 2002. "On magnetic spectra of Earth and Mars." J. Geophys. Res.-Planets 107 (E6): 5034 [ 10.1029/2001/JE001534]

    Sabaka, T. J., N. Olsen, and R. A. Langel. 2002. "A comprehensive model of the quiet-time, near-Earth magnetic field: Phase 3." Geophysical Journal International 151 (1): 32-68 [10.1046/j.1365-246X.2002.01774.x]

    Merayo, J., F. Primdahl, P. Brauer, et al. T. Risbo, N. Olsen, and T. Sabaka. 2001. "The orthogonalization of magnetic systems." Sensors and Actuators A: Physical 89 (3): 185-196 [10.1016/s0924-4247(00)00515-x]

    Olsen, N., T. J. Sabaka, and L. Toffner-Clausen. 2000. " Determination of the IGRF 2000 model." Earth Planets and Space 52 (12): 1175-1182 [Full Text (Link)] [10.1186/BF03352349]

    Purucker, M., D. Ravat, H. Frey, et al. C. Voorhies, T. Sabaka, and M. Acuna. 2000. "An altitude-normalized magnetic map of Mars and its interpretation." Geophys. Res. Lett. 27 (16): 2449-2452 [10.1029/2000GL000072]

    Olsen, N., R. Holme, G. Hulot, et al. T. Sabaka, T. Neubert, L. Tøffner-Clausen, F. Primdahl, J. Jørgensen, J.-M. Léger, D. Barraclough, J. Bloxham, J. Cain, C. Constable, V. Golovkov, A. Jackson, P. Kotzé, B. Langlais, S. Macmillan, M. Mandea, J. Merayo, L. Newitt, M. Purucker, T. Risbo, M. Stampe, A. Thomson, and C. Voorhies. 2000. "Ørsted Initial Field Model." Geophysical Research Letters 27 (22): 3607-3610 [10.1029/2000gl011930]

    Sabaka, T. J., R. A. Langel, R. T. Baldwin, and J. A. Conrad. 1997. "The geomagnetic field 1900-1995, including the large-scale field from magnetospheric sources, and the NASA candidate models for the 1995 revision of the IGRF." Journal of Geomagnetism and Geoelectricity 49 (2-3): 157-206 [Full Text (Link)] [10.5636/jgg.49.157]

    Langel, R. A., J. A. Conrad, and T. J. Sabaka. 1997. "Adjustment of UARS, POGS, and DE-1 satellite magnetic field data for modeling of Earth's main field." Journal of Geomagnetism and Geoelectricity 49 (2-3): 393-415 [Full Text (Link)]

    Sabaka, T. J., R. A. Langel, R. T. Baldwin, and J. A. Conrad. 1997. "The geomagnetic field 1900-1995, including the large-scale field from magnetospheric sources, and the NASA candidate models for the 1995 revision of the IGRF." Journal of geomagnetism and geoelectricity 49 (2-3): 157-206 [Full Text (Link)] [10.5636/jgg.49.157]

    Purucker, M. E., T. J. Sabaka, R. A. Langel, and N. Olsen. 1997. "The missing dimension in Magsat and POGO anomaly studies." Geophysical Research Letters 24 (22): 2909-2912 [10.1029/97gl52978]

    Purucker, M., T. Sabaka, and R. Langel. 1996. "Conjugate Gradient Analysis: A New Tool For Studying Satellite Magnetic Data Sets." Geophysical Research Letters 23 (5): 507-510 [Full Text (Link)] [10.1029/96GL00388]

    Barton, C., R. Baldwin, D. Barraclough, et al. S. Bushati, M. Chiappini, Y. Cohen, R. Coleman, G. Hulot, P. Kotzé, V. Golovkov, A. Jackson, R. Langel, F. Lowes, D. McKnight, S. Macmillan, L. Newitt, N. Peddie, J. Quinn, and T. Sabaka. 1996. "International Geomagnetic Reference Field, 1995 revision Presented by IAGA Division V, Working Group 8." Physics of the Earth and Planetary Interiors 97 (1-4): 23-26 [10.1016/0031-9201(96)03139-1]

    Langel, R., T. Sabaka, R. Baldwin, and J. Conrad. 1996. "The near-Earth magnetic field from magnetospheric and quiet-day ionospheric sources and how it is modeled." Physics of the Earth and Planetary Interiors 98 (3-4): 235-267 [10.1016/s0031-9201(96)03190-1]

    Langel, R. A., T. J. Sabaka, and R. T. Baldwin. 1992. "The Geomagnetic Field: 1970-1990 and the NASA Candidate Models for DGRF1985 and IGRF1990.." Journal of geomagnetism and geoelectricity 44 (9): 745-767 [10.5636/jgg.44.745]

    Langel, R. A., R. H. Estes, and T. J. Sabaka. 1989. "Uncertainty estimates in geomagnetic field modeling." Journal of Geophysical Research 94 (B9): 12281 [10.1029/jb094ib09p12281]

    Langel, R. A., D. R. Barraclough, D. J. Kerridge, et al. V. P. Golovkov, T. J. Sabaka, and R. H. Estes. 1988. "Definitive IGRF models for 1945, 1950, 1955, and 1960.." Journal of geomagnetism and geoelectricity 40 (6): 645-702 [10.5636/jgg.40.645]

    Non-Refereed

    Mazarico, E. M., F. G. Lemoine, S. J. Goossens, et al. T. J. Sabaka, J. B. Nicholas, D. D. Rowlands, G. A. Neumann, M. H. Torrence, D. E. Smith, and M. T. Zuber. 2013. "Improved precision orbit determination of lunar orbiters from GRAIL-derived lunar gravity models." Spaceflight Mechanics 2013 (AAS/AIAA Spaceflight Mechanics Meeting, Feb. 10-14, 2013, Kauai, Hawaii), Advances in the Astronautical Sciences 148, Part II 1125-1141

    Lemoine, F. G., S. J. Goossens, T. J. Sabaka, et al. J. B. Nicholas, E. M. Mazarico, D. D. Rowlands, B. D. Loomis, D. S. Chinn, D. Caprette, G. A. Neumann, D. E. Smith, and M. T. Zuber. 2013. "Modeling and precise orbit determination in suport of gravity model development for the GRAIL mission." Spaceflight Mechanics 2013 (AAS/AIAA Spaceflight Mechanics Meeting, Feb. 10-14, 2013, Kauai, Hawaii), Advances in the Astronautical Sciences 148, Part II 1111-1123

    Olsen, N., G. Hulot, and T. J. Sabaka. 2010. "Sources of the geomagnetic field and the modern data that enable their investigation." The Handbook of Geomathematics

    Langel, R. A., T. J. Sabaka, and R. T. Baldwin. 1991. "Geomagnetic model investigations for 1980 - 1989: A model for strategic defense initiative particle beam experiments and a study in the effects of data types and observatory bias solutions." NASA-TM-104541 [Full Text (Link)]

    Langel, R. A., T. J. Sabaka, and R. T. Baldwin. 1991. "An initial analysis of the data from the Polar Orbiting Geophysical (POGS) Satellite." NASA-TM-104551 [Full Text (Link)]

    Langel, R. A., and T. J. Sabaka. 1990. "Processing of DMSP magnetic data: Handbook of programs, tapes, and datasets." NASA-TM-100757 [Full Text (Link)]

    Ridgeway, J. R., T. J. Sabaka, and D. S. Chinn. 1989. "Processing of DMSP magnetic data and its use in geomagnetic field modeling." NASA-TM-100750 [Full Text (Link)]

                                                                                                                                                                                            
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