Dr. Karpen has been a research astrophysicist in the Space Weather Laboratory, Heliophysics Division, since July 2008. Her primary research interests include analytical and numerical modeling of dynamic solar and heliospheric phenomena, and applications of plasma physics and magnetohydrodynamics to solar and heliospheric activity. Dr. Karpen has been a Principal or Co-Investigator in research sponsored by NASA's Heliophysics Theory Program, Heliophysics SR&T program, Heliophysics Guest Investigator programs, LWS TR&T program, and High Performance Computing and Communications Program. In addition she has served as a Principal or Co-Investigator on several grants of computer time under the DoD High Performance Computing Modernization program, which primarily supports long-duration numerical simulations performed for her research. She is an Associate Scientist on NRL's LASCO coronagraph on the SOHO mission and on the XRT instrument on Hinode, and a Co-Investigator on the SECCHI instrument suite on STEREO.
Dr. Karpen was a research physicist in the Solar-Terrestrial Relationships Branch of the Space Science Division of the Naval Research Laboratory from October 1984 to July 2008. From October 1980 until September 1982, Dr. Karpen was an NRL-NRC Postdoctoral Research Associate with the Solar Physics Branch, Space Science Division, NRL. From October 1982 until September 1984, she was a staff scientist with Berkeley Research Associates, working at the Laboratory for Computational Physics, NRL.
BS Physics (Honors), University of Michigan, 1973
PhD Astronomy, University of Maryland, 1980
Membership in Professional Societies: American Astronomical Society, Solar Physics Division (AAS/SPD); International Astronomical Union; American Geophysical Union
NASA committees: Solar Physics Branch MOWG, 1992-1995; GSFC Space Science Visiting Committee, 2000-2004; Space Science Advisory Committee (SScAC), 2002-2005; numerous panel and mail-in reviews
NAS/NRC committees: Committee on Solar and Space Physics, 1997-2000; Solar-Heliospheric Panel of the Solar and Space Physics Decadal Survey, 2001-2002
1. "Are Magnetic Dips Necessary for Prominence Formation?," J.T. Karpen, S.K. Antiochos, M. Hohensee, J. A. Klimchuk, & P. J. MacNeice, 2001, ApJ, 553, L85
2. "Coronal Magnetic Field Relaxation by Null-Point Reconnection," S. K. Antiochos, J. T. Karpen, & C. R. DeVore, 2002, ApJ, 575, 578.
3. "Constraints on the Magnetic Field Geometry in Prominences," J.T. Karpen, S.K. Antiochos, J. A. Klimchuk, & P. J. MacNeice, 2003, ApJ, 593, 1187
4. "Constraints on Active Region Coronal Heating," S. K. Antiochos, J. T. Karpen, E. E. DeLuca, L. Golub, & P. Hamilton 2003, ApJ, 590, 547
5. "Prominence Formation by Thermal Nonequilibrium in the Sheared-Arcade Model," J. T. Karpen, S. E. M. Tanner, S. K. Antiochos, & C. R. DeVore 2005, ApJ, 635, 1319
6. "The Origin of High-Speed Motions and Threads in Prominences," J.T. Karpen, S.K. Antiochos, & J. A. Klimchuk 2006, ApJ, 637, 531
7. "Structure and Dynamics of the Sun's Open Magnetic Field," S.K. Antiochos, C.R. DeVore, J. T. Karpen, & Z. Mikic, 2007, ApJ, 671, 936
8. "Condensation Formation by Impulsive Heating in Prominences," J. T. Karpen & S. K. Antiochos, 2008, ApJ, 676, 658.