Graduated with Honors from Washington University in St. Louis, attended Oxford University on a Rhodes Scholarship, served four years as an Air Force Lieutenant in the Air Force Office of Scientific Research, complete a Ph.D. while working at the Joint Institute for Laboratory Astrophysics (NBS and U of Colorado). Joined GSFC in Feb 1968 and has served at different times as solar branch head, solar program office chief (NASA HQ), project scientist, international astrophysics monograph series coordinator, as well as research astrophysicist and senior staff scientist.
Research
Include solar atmospheric energy balance and dynamics, especially shock wave heating and radiative losses; formation of optically thick spectral lines, especially the resonance lines of helium, and pursuing the solar-stellar connection, and, more recently, investigating the Sun-climate connection.
Solar and Stellar Atmospheres
Projects
CoInvestigator on SERTS (Solar Sounding Rocket)
CoInvestigator on SOHO (SUMER Experiment)
Associate Scientist on SOHO (CDS Experiment)
Associate Scientist on EUNIS (Solar Sounding Rocket)
Chair, Science Organizing Committee
Workshop on Helium Line Formation in the Sun, Naples, IT
Positions and Appointments
1977 - 1994Coordinator, NASA/CNRS Monograph Series on Nonthermal Stellar Atmospheres
1984 - 1989Head, Solar Physics Branch, GSFC
1980 - 1985Project Scientist, SOT, GSFC
1981 - 1982Associate Chief, Laboratory for Astronomy and Solar Physics (Temporary/GSFC)
1975 - 1980 Study Scientist, SOT, GSFC
1974 - 1975 Chief, Solar Physics Office, (Acting, NASA HQ)
1968 - 1973 Research Astrophysicist, GSFC
1963 - 1968 Research Assistant, JILA, Boulder
1959 - 1963 Lt. USAF with AFOSR
Education
1958 -B. S. (Engineering Physics), Washington University
1959 -Independent Study (Mathematics), Oxford University, UK
1968 -Ph.D. (Physics and Astrophysics), University of Colorado
Professional Memberships
International astronomical Union (IAU)
American Astronomical Society (AAS)
Solar Physics Division (SPD) of the AAS
American Geophysical Union (AGU)
Federation of American Scientists (FAS)
Sigma Xi ( )
Tau Beta Pi ( )
Professional Services
"Aerodynamic Phenomena in Stellar Atmospheres," IAU Symposium No. 28, Academic Press, 1966.
"Wolf-Rayet Stars," NBS SP-307, GPO, 1968.
With co-editor E. Aurett, "Stellar Chromospheres," IAU Colloquium No. 19, NASA SP-317, 1973.
"The Sun as a Star," NASA/CNRS Monograph Series on Nonthermal Phenomena in Stellar Atmospheres, NASA SP-450, 1981.
Publications
Underhill, A., and Doozan V., "B Stars With and Without Emission Lines," NASA SP-456, 1982.
Wolff, S.C., "The A-Type Stars: Problems and Perspectives," NASA SP-463, 1983.
Thomas, R. N., "Stellar Atmospheric Structural Patterns," NASA SP-471, 1984.
Johnson, H. R., and Querci, F. R., "The M-Type Stars," NASA SP-492, 1986.
Conti, P. S., and Underhill, A. B., "O Stars and Wolf-Rayet Stars," NASA SP-497, 1988.
Cram, L. E., and Kuhi, L. V., "F, G, K Stars and T Tauri Stars," NASA SP-502, 1989.
Hack, M., "Cataclysmic Variables," NASA SP, 507, 1993.
S. D. Jordan, "The Temperature Distribution in the Solar Chromosphere,. NASA TR, R-291, 1969.
S. D. Jordan, "Why the Temperature Rise does not Occur in Radiative Equilibrium in Stellar Chromospheres of Dominant H- Opacity," Ap. J., 157, p. 465, 1969.
S. D. Jordan, "The Effect of the Density Scale Height on Shock Wave Heating in the Low Solar Chromosphere," Ap.J., 161, p. 1189, 1970.
R. D. Chapman, S. D. Jordan, W. M. Neupert, and R. J. Thomas, "Evidence for the 300-Second Oscillations from OSO-7 Extreme-Ultraviolet Observations," Ap.J., 174, p. L97, 1972.
S. D. Jordan, "Further Aspects of Weak Shock Theory Applied to the Solar Chromosphere," Solar Phys., 30, 327, 1973.
R. W. Hobbs, S. D. Jordan, S. P. Maran, H. M. Caulk, and W. J. Webster, Jr., "Small-Scale Structure in Solar Flaring Regions Observed at Wavelengths of 3.71 and 11.1 cm," Astrophys. J. Letters, 15, p. 193, 1973.
R. W. Hobbs, S. D. Jordan, W. J. Webster, Jr., S. P. Maran, and H. M. Caulk, "1.0 Arc Second Structure on the Sun at 3.71 cm Wavelength," Solar Phys., 36, p. 369, 1974.
S. D. Jordan, "Physical Processes Determining the Chromospheric Temperature Distribution," Solar Phys, 1, p. 51, 1977.
S. D. Jordan, "The Solar Optical Telescope (SOT)," Space Science Reviews, 229, p. 33, 1982.
S. D. Jordan, W. T. Thompson, R. J. Thomas, and W. M. Neupert, "Solar Coronal Observations and Formation of the HeII 304A Line," Ap.J., 406, p. 346, 1993.
S. D. Jordan, "Solar Chromospheric Heating by Acoustic Shocks," Ap.J, 414, p. 337, 1993.
W. T. Thompson, W. M. Neupert, S. D. Jordan, H. R. Jones, R. J. Thomas, and B. Schmieder, "Corralation of HeII Lyman Alpha with HeI 10830, and with Chromospheric and EUV Coronal Emission," Solar Phys, 17, p. 29, 1993.
K. Wilhelm and 13 Coauthors including S.D. Jordan, "SUMER-Solar Ultraviolet Measurements of Emitted Radiation," Solar Phys, 1995.
K. Wilhelm, and 13 co-authors including S.D. Jordan, .First Results of the SUMERTelescope and Spectrometer on SOHO (I) Spectra and Spectroradiometry,. Solar Phys,170, 75, 1997.
P. Lemaire, and 13 co-authors including S.D. Jordan, .First Results of the SUMERTelescope and Spectrometer on SOHO (II) Imagery and Data management,. Solar Phys,170, 105, 1997.
S.D. Jordan, A. Garcia, and V. Bumba, .Interpreting the Large Limb Eruption of July 9, 1982,. Solar Phys, 173, 359, 1997.
V. Bumba, A. Garcia, and S.D. Jordan, .Growth and Destruction of a Large Long-Duration Active-Region Complex and Its Replacement by a Coronal Hole,. Astron & Astrophys, 329, 1138, 1998.
D. Falconer, S.D. Jordan, J. Brosius, J. Davilla, R.J. Thomas, V. Andretta, and H. Hara, .Using Strong Coronal Emission Lines as Coronal Flux Proxies,. Solar Phys, 180, 179, 1998.
V. Andretta, S.D. Jordan, J. Brosius, J. Davila, R.J. Thomas, W. Behring, W. Thompson, and A. Garcia,.The Role of Velocity Redistribution in Enhancing the Intensity of the He II 304Å Line in the Quiet Sun Spectrum,. Astrophys J., 535, 438, 2000.
S.D. Jordan, V. Andretta, and J. Brosius, .Formation of the He II 304Å Line in Solar Active Regions,. in preparation.
G. Del Zanna, V. Andretta, and S.D. Jordan, .Direct Tests of the Role of Coronal Radiation in the Formation of the Principle He I and He II Resonance Lines,. in preparation.
S.D. Jordan, C. Braun, A. Garcia, and J. Brosius, .Possible Roles of Large Solar Ultraviolet Irradiance Changes on Terrestrial Cloud Cover,. in preparation.
OTHER PUBLICATIONS (Including invited papers):
S. D. Jordan, S. A. Kaplan, and S. B. Pickelner, "Aerodynamic Phenomena in Stellar Atmospheres," JILA Report #25, 1964.
S. D. Jordan, "The Temperature Structure and Energy Balance in the Solar Chromosphere," Ph.D. Thesis, University of Colorado, 1968.
S. D. Jordan, "Energy Balance and Temperature in the Solar Chromosphere," Astron. J., 73, No. 10, Part 2, S186, 1968.
S. D. Jordan, "Why the Temperature Rise Does Not Occur in Radiative Equilibrium in the Low Solar Chromosphere," Bull. Amer. Astron. Soc., I., No. 3, 282, 1969.
S. D. Jordan, "The Heating of the Solar Chromosphere," in Significant Accomplishments in Science and Technology at Goddard, NASA SP-251, 1969.
S. D. Jordan, S. P. Maran, "Recent Advances in Solar Physics," Earth and Extraterrestrial Sciences, 1, 73, 1970.
S. D. Jordan, "Some Comments on Shock Wave Heating of the Low Solar Chromosphere," Bull. Amer. Astron. Soc., II, No. 2, 202, 1970.
S. D. Jordan, "Estimates of the Role of Mechanical Heating in the Low Solar Chromosphere," Bull. Amer. Astron. Soc., III, 3, 262, 1971.
S. D. Jordan, "A New Slant on Discrepancies Given by Weak Shock Theory in the Solar Chromosphere," Bull Amer. Astron. Soc., III, 4, 462, 1971.
S. D. Jordan, S. P. Maran, W. M. Neupert, K. J. Frost, and J. C. Brandt, "Workshop on Orbiting Solar Observatories," Earth and Extraterrestrial Sciences, 1, 205, 1971.
R. W. Hobbs, S. D. Jordan, and W. J. Webster, Jr., "High Resolution Measurements of the Sun at 3.71 and 11.1 cm Wavelength," Bull. Amer. Astron. Soc., IV, 3, 310, 1972.
S. R. Heap, D. S. Leckrone, S. D. Jordan, and A. B. Underhill, "A Working Conference on Stellar Chromospheres," Earth and Extraterrestrial Sciences, 2, 69, 1972.
S. D. Jordan, "Mechanical Heating in Stellar Chromospheres," IAU Colloquium No. 19 on Stellar Chromospheres, published as NASA Sp-317 181, 1973.
R. W. Hobbs, S. D. Jordan, W. S. Webster, Jr., and S. P. Maran, "High Resolution Observations of a Solar Active Region at 3.71 and 11.1 cm Wavelength," Bull. Amer. Astron. Soc., 2, 284, 1973.
S. D. Jordan, "Can the Dissipation of High Frequency Sound Waves in the Low Chromosphere Produce the Temperature Rise?" Bull. Amer. Astron. Soc, VI, 1974.
S. D. Jordan, "The Role of the 300 Second Oscillations in Chromospheric Heating," Proceedings of the OSO-8 Workshop, Colorado, 340, 1977.
S. D. Jordan, "Chromospheric Heating," in The Sun as a Star, NASA SP-450, 301, 1981.
S. D. Jordan, "Solar-Stellar Astrophysics," Comments on Astrophysics, 9, 21, 1982.
S. D. Jordan, "Summary on Solar Velocity Fields," in "Observational Basis for Velocity Fields in Stellar Atmospheres," NASA/NATO/Trieste Workshop on Astronomy, 445, 1983.
G. D. Hogan, and S. D. Jordan, "The Solar Optical Telescope," Proceedings of the 22nd AIAA Aerospace Sciences Symposium, Reno, 1984.
S. D. Jordan, and G. D. Hogan, "Science with the Solar Optical Telescope," Proceedings of the 22nd AIAA Aerospace Sciences Symposium, Reno, 1984
S. D. Jordan, "Science with the Solar Optical Telescope (SOT)," The Hydromagnetics of the Sun," ESA SP-220, 165, 1984.
S. D. Jordan, "Helio- and Astro-Seismology," in Proceedings of Trieste Workshop on Stellar Pulsation and Mass Loss, Reidel, 1988.
S. D. Jordan, "Solar Research from Space 1985-1987," in Highlights of Astronomy, 1985, 1988.
K. Wilhelm, and 13 Coauthors including S. D. Jordan, "SUMER-Solar Ultraviolet Measurements of Emitted Radiation," ESA SP-1104, 1989.
S. D. Jordan, "Solar Research from Space 1988-1990," in Highlights of Astronomy, 1988, 1991.
S. D. Jordan, "Solar Chromosphere Heating," Bull. Amer. Astron. Soc., XXIII, 2, 1037, 1991.
S. D. Jordan, .Formation of the HeII 304 Line in the Solar Atmosphere," Bull. Amer. Astron. Soc., XXIII, 4, 1387, 1991.
S. D. Jordan, "Coronal Radiation and the Formation of the HeII 304 Line," Bull. Amer. Astron. Soc., XXV, 3, 1211, 1993.
S.D. Jordan, J. M. Davila, R. J. Thomas, and W. T. Thompson, "Formation of the HeII 304 Line in the Sun," in Significant Goddard Achievements in Research and Technology, 1993.
S.D. Jordan, "Microturbulence and Formation at the HeII 304Line," in Proc. IAU Coloquium #144, 415, 1993.
S. D. Jordan, "Solar Space Research 1991-1993," in Highlights of Astronomy, Kluwer, 1994.
S. D. Jordan, J. M. Davila, R. J. Thomas, and W. T. Thompson, "Where in the Solar Transition Region is the HE 304A Line Formed?" in Bull. Amer. Geophys. Soc.,1994.
S. D. Jordan, J.M. Davila, R.J. Thomas, and A. Garcia, "Are Spicules Evidence for Small-scale Motions that Redistribute He II Ions to Produce Enhanced 304A Line Emission," Bull.Amer. Astron. Soc., XXVII, 2, 958, 1995.
J.W. Brosius, J.M. Davilla, S.D. Jordan, and B.C. Monsignori-Fossi, .Solar EUV Spectroscopy with SERTS: Measurements of Active and Quiet Sun Properties,. in UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, eds. K. Yamashito and T. Watanabe, Universal Academy Press, Inc., Tokyo, 1996.
S.D. Jordan, A. Garcia, and V. Bumba, .The Large Limb Event of July 9, 1982,. Bull Amer. Astron. Soc., XXVIII, 2, 939, 1996.
S.D. Jordan, V. Andretta, A. Garcia, and D. Falconer, .Understanding the He II 304 A Resonance Line in the Sun,. Proc. 5th SOHO Workshop, ESA SP-404, 439, 1997.
V. Andretta, S.D. Jordan, H.P. Jones, and M.J. Penn, .Investigating the Formation of the Helium Spectrum with Coordinated SOHO/Kitt Peak/Sacramento Peak Observations,. Proc 5th SOHO Workshop, ESA SP-404, 163, 1997.
V. Andretta, S.D. Jordan, K. Muglach, A. Garcia, H. Jones, and D. Soltau, .Investigating the Formation of the Helium Spectrum in the Solar Atmosphere,. Proc. 1997 Cool Star Workshop, Cambridge, 1997.
P. Lemaire and 8 other coauthors including S.D. Jordan, .High Resolution Solar Ultraviolet Measurements, Advances in Space Research, 20, #12, 2249, 1997.
S.D. Jordan, V. Andretta, and A. Garcia, .A Lower Limit on Nonthermal Velocities of Quiet- Sun He II Ions,. Annales Geophysicae, C919, 1998.
A. Garcia, S.D. Jordan, J. Brosius, and V. Andretta, .Observational Support for .Velocity Redistribution. of He II Ions,. Annales Geophysicae, C917, 1998.
S.D. Jordan, V. Andretta, J. Brosius, W. Behring, and A. Garcia, .Velocity Redistribution as a HeII 304 Intensity Enhancement Mechanism,. Bull. Amer. Astron. Soc., XXXI, #3, 990, 1999.
S.D. Jordan, V. Andretta, A. Garcia, J. Brosius, and W. Behring, .Does Velocity Redistribution Really Enhance the He 304Å Line to Observed Intensities?. in Magnetic Fields and Solar Processes, ESA SP-448, 303, 1999.
V. Andretta, E. Landi, G. Del Zanna, and S.D. Jordan, .A Direct Comparison between EUV Coronal Flux and Helium Resonance Line Photon Flux from SOHO/CDS Data,. Proc. 8th SOHO Workshop, ESA SP-446, 123, 1999.
S.D. Jordan, .Summary Discussion,. in Helium Line Formation in a Dynamical Solar Atmosphere, Report of Osservatorio Astronomico di Capodimonte OAC # 1/2000, 2000.
C. Braun, and S.D. Jordan, .A PC-Based Computer Program to Study Radiative Processes Involved in Global Warming,. in Bull. Amer. Geophys. Soc., 2000.
