Dr. Graham Stewart Kerr

Dr. Graham Stewart Kerr

  • RESEARCH ASSOCIATE
  • 202.255.4209
  • NASA/GSFC
  • Mail Code: 670
  • WASHINGTON , DC 20064
  • Employer: CATHOLIC UNIV OF AMERICA
  • Brief Bio

    Graham graduated from the University of Glagow with an MSci (Hons.) degree. He then obtained his PhD, also from the University of Glasgow, in 2017, supervised by Prof Lyndsay Fletcher. Upon completion of his PhD, Graham became a NASA Postdoctoral Program (NPP) Fellow at Goddard Space Flight Center in 2017, working with Dr. Joel Allred on the modelling of solar flares. His research focuses on understanding the energy, radiation, and mass transport during of solar flares, with a particular focus on the solar chromosphere. This is achieved via state-of-the-art radiation hydrodynamical modelling of the solar atmosphere and the analysis of  data from NASA observatories. After the conclusion of the NPP Fellowship, Graham was appointed a Research Associate through the Catholic University of America, in which role he continue to be based at NASA Goddard Space Flight Center.

    Positions/Employment

    4/2020 - Present

    Research Associate

    The Catholic University of America, NASA Goddard Space Flight Center, Greenbelt Md
    4/2017 - 4/2020

    NASA Postdoctoral Program (NPP) Fellow

    Universities Space Research Association (USRA), NASA Goddard Space Flight Center, Greenbelt Md
    10/2012 - 12/2016

    Graduate Student

    University of Glasgow, Glasgow, United Kingdom

    Education

    MSci (Hons.) 1st Class Astronomy & Physics (2012), Univeristy of Glasgow, Scotland UK

    PhD Astrophysics (2017), Univeristy of Glasgow, Scotland UK

    • Supervised by Prof. Lyndsay Fletcher
    • Thesis: Observations and Modelling of the Chromosphere During Solar Flares.
    • Thesis submitted Sept 2016, Viva passed Dec 2016, Final award Feb 2017.

     

    Professional Societies

    American Astronomical Society, 2020 - Present
    Solar Physics Division, 2017 - Present

    Professional Service

    • Co-Leader of an International Space Science Institute (ISSI) International Team: Interrogating Field-Aligned Solar Flare Models: Comparing, Contrasting and Improving​ (2019-present): http://www.issibern.ch/teams/fieldsolflare/


    Publications

    Refereed

    Kerr, G. S., Y. Xu, J. C. Allred, et al. V. Polito, V. M. Sadykov, N. Huang, and H. Wang. 2021. "He i 10830 Å Dimming during Solar Flares. I. The Crucial Role of Nonthermal Collisional Ionizations." The Astrophysical Journal, 912 (2): 153 [10.3847/1538-4357/abf42d]

    Allred, J. C., M. Alaoui Abdallaoui, A. F. Kowalski, and G. S. Kerr. 2020. "Modeling the Transport of Nonthermal Particles in Flares Using Fokker-Planck Kinetic Theory." The Astrophysical Journal, 902 (1): 16 [10.3847/1538-4357/abb239]

    Kerr, G. S., J. C. Allred, and V. Polito. 2020. "Solar Flare Arcade Modeling: Bridging the Gap from 1D to 3D Simulations of Optically Thin Radiation." The Astrophysical Journal, 900 (1): 18 [10.3847/1538-4357/abaa46]

    Sadykov, V. M., A. G. Kosovichev, I. N. Kitiashvili, and G. S. Kerr. 2020. "Response of SDO/HMI Observables to Heating of the Solar Atmosphere by Precipitating High-energy Electrons." The Astrophysical Journal, 893 (1): 24 [10.3847/1538-4357/ab7b6a]

    Kerr, G. S., M. Carlsson, and J. C. Allred. 2019. "Modeling Mg ii during Solar Flares. II. Nonequilibrium Effects." The Astrophysical Journal, 885 (2): 119 [10.3847/1538-4357/ab48ea]

    Kerr, G. S., J. C. Allred, and M. Carlsson. 2019. "Modeling Mg II During Solar Flares. I. Partial Frequency Redistribution, Opacity, and Coronal Irradiation." The Astrophysical Journal, 883 (1): 57 [10.3847/1538-4357/ab3c24]

    Kowalski, A. F., E. Butler, A. N. Daw, et al. L. Fletcher, J. C. Allred, B. D. Pontieu, G. S. Kerr, G. Cauzzi, A. F. Kowalski, and E. Bulter. 2019. "Spectral Evidence for Heating at Large Column Mass in Umbral Solar Flare Kernels. I. IRIS Near-UV Spectra of the X1 Solar Flare of 2014 October 25." The Astrophysical Journal, 878 (2): 135 [10.3847/1538-4357/ab1f8b]

    Kerr, G. S., M. Carlsson, J. C. Allred, P. R. Young, and A. N. Daw. 2019. "SI iv Resonance Line Emission during Solar Flares: Non-LTE, Nonequilibrium, Radiation Transfer Simulations." The Astrophysical Journal, 871 (1): 23 [10.3847/1538-4357/aaf46e]

    Sadykov, V. M., A. G. Kosovichev, I. N. Sharykin, and G. S. Kerr. 2019. "Statistical Study of Chromospheric Evaporation in Impulsive Phase of Solar Flares." The Astrophysical Journal, 871 (1): 2 [10.3847/1538-4357/aaf6b0]

    Brown, S. A., L. Fletcher, G. S. Kerr, et al. N. Labrosse, A. F. Kowalski, and J. D. Rodríguez. 2018. "Modeling of the Hydrogen Lyman Lines in Solar Flares." The Astrophysical Journal, 862 (1): 59 [10.3847/1538-4357/aacc29]

    Simões, P. J., G. S. Kerr, L. Fletcher, et al. H. S. Hudson, C. G. Giménez de Castro, and M. Penn. 2017. "Formation of the thermal infrared continuum in solar flares." Astronomy & Astrophysics, 605: A125 [10.1051/0004-6361/201730856]

    Kerr, G. S., L. Fletcher, A. J. Russell, and J. C. Allred. 2016. "Simulations of the Mg II k and Ca II 8542 lines from an Alfven Wave-heated Flare Chromosphere." The Astrophysical Journal, 827 (2): 101.

    Kerr, G. S., P. J. Simões, J. Qiu, and L. Fletcher. 2015. "IRIS observations of the Mg ii h and k lines during a solar flare." Astronomy & Astrophysics, 582: A50 [10.1051/0004-6361/201526128]

    Milligan, R. O., G. S. Kerr, B. R. Dennis, et al. H. S. Hudson, L. Fletcher, J. C. Allred, P. C. Chamberlin, J. Ireland, M. Mathioudakis, and F. P. Keenan. 2014. "THE RADIATED ENERGY BUDGET OF CHROMOSPHERIC PLASMA IN A MAJOR SOLAR FLARE DEDUCED FROM MULTI-WAVELENGTH OBSERVATIONS." ASTROPHYSICAL JOURNAL, 793: [10.1088/0004-637X/793/2/70]

    Kerr, G. S., and L. Fletcher. 2014. "PHYSICAL PROPERTIES OF WHITE-LIGHT SOURCES IN THE 2011 FEBRUARY 15 SOLAR FLARE." The Astrophysical Journal, 783 (2): 98 [10.1088/0004-637x/783/2/98]

    Cheng, J. X., G. Kerr, and J. Qiu. 2011. "HARD X-RAY AND ULTRAVIOLET OBSERVATIONS OF THE 2005 JANUARY 15 TWO-RIBBON FLARE." The Astrophysical Journal, 744 (1): 48 [10.1088/0004-637x/744/1/48]

    Brief Bio

    Graham graduated from the University of Glagow with an MSci (Hons.) degree. He then obtained his PhD, also from the University of Glasgow, in 2017, supervised by Prof Lyndsay Fletcher. Upon completion of his PhD, Graham became a NASA Postdoctoral Program (NPP) Fellow at Goddard Space Flight Center in 2017, working with Dr. Joel Allred on the modelling of solar flares. His research focuses on understanding the energy, radiation, and mass transport during of solar flares, with a particular focus on the solar chromosphere. This is achieved via state-of-the-art radiation hydrodynamical modelling of the solar atmosphere and the analysis of  data from NASA observatories. After the conclusion of the NPP Fellowship, Graham was appointed a Research Associate through the Catholic University of America, in which role he continue to be based at NASA Goddard Space Flight Center.

    Publications

    Refereed

    Kerr, G. S., Y. Xu, J. C. Allred, et al. V. Polito, V. M. Sadykov, N. Huang, and H. Wang. 2021. "He i 10830 Å Dimming during Solar Flares. I. The Crucial Role of Nonthermal Collisional Ionizations." The Astrophysical Journal 912 (2): 153 [10.3847/1538-4357/abf42d]

    Allred, J. C., M. Alaoui Abdallaoui, A. F. Kowalski, and G. S. Kerr. 2020. "Modeling the Transport of Nonthermal Particles in Flares Using Fokker-Planck Kinetic Theory." The Astrophysical Journal 902 (1): 16 [10.3847/1538-4357/abb239]

    Kerr, G. S., J. C. Allred, and V. Polito. 2020. "Solar Flare Arcade Modeling: Bridging the Gap from 1D to 3D Simulations of Optically Thin Radiation." The Astrophysical Journal 900 (1): 18 [10.3847/1538-4357/abaa46]

    Sadykov, V. M., A. G. Kosovichev, I. N. Kitiashvili, and G. S. Kerr. 2020. "Response of SDO/HMI Observables to Heating of the Solar Atmosphere by Precipitating High-energy Electrons." The Astrophysical Journal 893 (1): 24 [10.3847/1538-4357/ab7b6a]

    Kerr, G. S., M. Carlsson, and J. C. Allred. 2019. "Modeling Mg ii during Solar Flares. II. Nonequilibrium Effects." The Astrophysical Journal 885 (2): 119 [10.3847/1538-4357/ab48ea]

    Kerr, G. S., J. C. Allred, and M. Carlsson. 2019. "Modeling Mg II During Solar Flares. I. Partial Frequency Redistribution, Opacity, and Coronal Irradiation." The Astrophysical Journal 883 (1): 57 [10.3847/1538-4357/ab3c24]

    Kowalski, A. F., E. Butler, A. N. Daw, et al. L. Fletcher, J. C. Allred, B. D. Pontieu, G. S. Kerr, G. Cauzzi, A. F. Kowalski, and E. Bulter. 2019. "Spectral Evidence for Heating at Large Column Mass in Umbral Solar Flare Kernels. I. IRIS Near-UV Spectra of the X1 Solar Flare of 2014 October 25." The Astrophysical Journal 878 (2): 135 [10.3847/1538-4357/ab1f8b]

    Kerr, G. S., M. Carlsson, J. C. Allred, P. R. Young, and A. N. Daw. 2019. "SI iv Resonance Line Emission during Solar Flares: Non-LTE, Nonequilibrium, Radiation Transfer Simulations." The Astrophysical Journal 871 (1): 23 [10.3847/1538-4357/aaf46e]

    Sadykov, V. M., A. G. Kosovichev, I. N. Sharykin, and G. S. Kerr. 2019. "Statistical Study of Chromospheric Evaporation in Impulsive Phase of Solar Flares." The Astrophysical Journal 871 (1): 2 [10.3847/1538-4357/aaf6b0]

    Brown, S. A., L. Fletcher, G. S. Kerr, et al. N. Labrosse, A. F. Kowalski, and J. D. Rodríguez. 2018. "Modeling of the Hydrogen Lyman Lines in Solar Flares." The Astrophysical Journal 862 (1): 59 [10.3847/1538-4357/aacc29]

    Simões, P. J., G. S. Kerr, L. Fletcher, et al. H. S. Hudson, C. G. Giménez de Castro, and M. Penn. 2017. "Formation of the thermal infrared continuum in solar flares." Astronomy & Astrophysics 605 A125 [10.1051/0004-6361/201730856]

    Kerr, G. S., L. Fletcher, A. J. Russell, and J. C. Allred. 2016. "Simulations of the Mg II k and Ca II 8542 lines from an Alfven Wave-heated Flare Chromosphere." The Astrophysical Journal 827 (2): 101

    Kerr, G. S., P. J. Simões, J. Qiu, and L. Fletcher. 2015. "IRIS observations of the Mg ii h and k lines during a solar flare." Astronomy & Astrophysics 582 A50 [10.1051/0004-6361/201526128]

    Milligan, R. O., G. S. Kerr, B. R. Dennis, et al. H. S. Hudson, L. Fletcher, J. C. Allred, P. C. Chamberlin, J. Ireland, M. Mathioudakis, and F. P. Keenan. 2014. "THE RADIATED ENERGY BUDGET OF CHROMOSPHERIC PLASMA IN A MAJOR SOLAR FLARE DEDUCED FROM MULTI-WAVELENGTH OBSERVATIONS." ASTROPHYSICAL JOURNAL 793 [10.1088/0004-637X/793/2/70]

    Kerr, G. S., and L. Fletcher. 2014. "PHYSICAL PROPERTIES OF WHITE-LIGHT SOURCES IN THE 2011 FEBRUARY 15 SOLAR FLARE." The Astrophysical Journal 783 (2): 98 [10.1088/0004-637x/783/2/98]

    Cheng, J. X., G. Kerr, and J. Qiu. 2011. "HARD X-RAY AND ULTRAVIOLET OBSERVATIONS OF THE 2005 JANUARY 15 TWO-RIBBON FLARE." The Astrophysical Journal 744 (1): 48 [10.1088/0004-637x/744/1/48]

                                                                                                                                                                                            
    NASA Logo, National Aeronautics and Space Administration