Dr. John B. Sigwarth NASA/GSFC, Code 696 Greenbelt, MD 20771 Phone: (301) 286-0166 Fax: (301) 286-1648 Email: John.B.Sigwarth@nasa.gov

PRESENT POSITION:

Astrophysicist, Electrodynamics Branch
Laboratory for Extraterrestrial Physics
NASA/Goddard Space Flight Center

EDUCATION:

B.S., Physics, Mathematical Sciences, University of Iowa, 1983
M.S., Physics, University of Iowa, 1988
Ph.D., Physics, University of Iowa, 1989

RESEARCH INTERESTS:

Conjugate nature of the northern and southern auroras.
The driving of the aurora by sharp increases in the dynamic pressure in the solar wind impacting the magnetosphere.
The coupling efficiency of energy from the solar wind to the magnetosphere as a function of the state of the solar wind.
The use of global auroral images to retrieve the energy deposition by auroral particles precipitating into the ionoshpere.
The study of the rate of production of oxygen, hydroxide, and sodium from Comet Hale-Bopp.

EXPERIENCE:

2002 -- Project Scientist for Visible Imaging System (VIS) onboard POLAR

1998 - NASA Group Achievement Award
1993 - Global Science Project Award
1982 - James A. Van Allen Award

SELECTED PUBLICATIONS:

1. Sigwarth, J. B., N. J. Fox, and L. A. Frank, Global Auroral Response to Dynamic Pressure Impulses in the Solar Wind, to be submitted to J. Geophys. Res. by April 30, 2002.

2. Sigwarth, J. B., N. J. Fox, and L. A. Frank, The Coupling Efficiency of the Solar Wind Magnetic Flux to Earth's Magnetosphere, to be submitted to J. Geophys. Res. by June 15, 2002.

3. Sigwarth, J. B., N. J. Fox, L. A. Frank, and D. Lummerzheim, Determination of the Energy and Energy Flux of Precipitating Electrons During an Auroral Substorm, to be submitted to J. Geophys. Res. by July 31, 2002.

4. Sigwarth, J. B., On the Global Conjugacy of the Nighttime Auroral Oval, to be submitted to J. Geophys. Res. by September 15, 2002.

5. Sigwarth, J. B., N. J. Fox, and L. A. Frank, Global Production of Na, O, and OH from Comet Hale-Bopp at Perihelion, to be submitted to J. Geophys. Res. by October 31, 2002.

6. Sigwarth, J. B. and L. A. Frank, 'Comment on Atmospheric Holes are Not Small Comets', by A. W. Harris, J. Geophys. Res., 105, 18,581-18,584, 2000.

7. Sigwarth, J. B. and L. A. Frank, Determination of Precipitating Energy and Energy Flux From Space-based Auroral Observations, EOS, 82(20), 288, 2001.

8. Sigwarth, J. B., L. A. Frank, and N. J. Fox, Efficiency of Energy Transfer from the Solar Wind to the Magnetosphere, EOS, 82(47), 1088, 2001.

9. Sigwarth, J. B. and L. A. Frank, Auroral Activity During the Initial and Main Phases of a Geomagnetic Storm, EOS, 81(19), 400, 2000.

10. Sigwarth, J. B., L. A. Frank and N. J. Fox, The Effect of a Dynamic Pressure Pulse in the Solar Wind on the Auroral Oval, Total Open Magnetic Flux of the Polar Cap and the Auroral Ionosphere, presented at the 33rd COSPAR Scientific Assembly, Warsaw, Poland, 16-23 July 2000.

11. Sigwarth, J. B., L. A. Frank, S. B. Mende, H. U. Frey and N. J. Fox, Overview of Auroral Activity During the Bastille Day Event 14-16 July 2000, EOS, 81(48), 970, 2000.

12. Sigwarth, J. B. and L. A. Frank, Magnetotail Energy Storage, Auroral Energy Dissipation, and Resulting Ionospheric Conductivities From VIS Auroral Images During the CME on February 18, 1999, EOS, 80(17), 247, 1999.

13. Sigwarth, J. B. and L. A. Frank, Optical Determination of the Polar Cap Area and Open Magnetic Flux With the Visible Imaging System, XXII IUGG/IAGA General Assembly, Birmingham, United Kingdom, p. B.346, 18-30 July 1999.

14. Sigwarth, J. B., L. A. Frank and N. J. Fox, The Effect of Dynamic Pressure Pulses in the Solar Wind on the Auroral Oval, Total Open Magnetic Flux of the Polar Cap and the Auroral Ionosphere, EOS, 80(46), 894, 1999.

15. Sigwarth, J. B. and L. A. Frank, Optical Determination of the Polar Cap Area and Open Magnetic Flux With the Visible Imaging System, EOS, 79(45), 760, 1998.

16. Sigwarth, J. B., L. A. Frank and W. R. Paterson, Simultaneous Observations of the Global Auroral Oval and the Magnetotail Plasma at Substorm Onset, EOS, 79(17), 320, 1998.

17. Sigwarth, J. B., L. A. Frank and W. R. Paterson, Simultaneous Observations of the Global Auroral Oval and the Magnetotail Plasma at Substorm Onset, presented at the International Conference on Substorms, ICS_4, Lake Hamana, Japan, p. 6, 9-13 March 1998.

18. Sigwarth, J. B., L. A. Frank, C. W. Carlson and D. Lummerzheim, Determination of Ionospheric Conductivities From the Auroral Observations Acquired With the Visible Imaging System, EOS, 79(17), 309, 1998.

19. Sigwarth, J. B., L. A. Frank, C. W. Carlson and D. Lummerzheim, Determination of Ionospheric Conductivities From the Auroral Observations Acquired With the Visible Imaging System, presented at the 32nd COSPAR Scientific Assembly, Nagoya, Japan, p. 216, 12-19 July 1998.

20. Sigwarth, J. B. and L. A. Frank, Imaging of the Northern Auroral Oval During the Coronal Mass Ejection of January 6, 1997, EOS, 78(46), 536, 1997.

21. Sigwarth, J. B. and L. A. Frank, Imaging of the Northern Auroral Oval With the Visible Imaging System on the Polar Spacecraft, 8th Scientific Assembly of International Association of Geomagnetism and Aeronomy (IAGA), Uppsala, Sweden, p. 181, 4-15 August 1997.

22. Sigwarth, J. B. and L. A. Frank, Imaging of the Northern Auroral Oval With the Visible Imaging System on the Polar Spacecraft, EOS, 78(17), 297, 1997.

23. Sigwarth, J. B. and L. A. Frank, Imaging of the Northern Auroral Oval with the Visible Imaging System on the Polar Spacecraft, presented at the International Symposium on Solar-Terrestrial Coupling Processes, Paros, Greece, 23-27 June 1997.

24. Sigwarth, J. B. and L. A. Frank, Images of Earth's Auroras From the Visible Imaging System (VIS) for the POLAR Spacecraft, EOS, 77(46), 623, 1996.

25. Sigwarth, J. B. and L. A. Frank, Images of Earth's Auroras From the Visible Imaging System (VIS) for the POLAR Spacecraft, paper presented at the 1st Alfven Conference, Kiruna, Sweden, 9-13 September 1996.

26. Sigwarth, J. B., L. A. Frank, and C. M. Yeates, A Search for Small Comets in Consecutive Images Acquired with a Ground-based Telescope, paper presented at the Twenty-eighth Plenary meeting, Committee on Space Research (COSPAR), The Hague, 25 June to 6 July 1990.

27. Sigwarth, J. B., L. A. Frank, and J. D. Craven, A Search for Small Comets in Consecutive Images Acquired with a Ground-based Telescope (abstract), Eos Trans. AGU, 70, 1182, 1989.

28. Sigwarth, J. B., L. A. Frank, and J. D. Craven, Imaging of Absorption and Emission Features of Water-Vapor Clouds Associated with Small Comets as Observed with Dynamics Explorer 1 (abstract), Eos Trans. AGU, 69, 1350, 1988.

29. Sigwarth, J. B., L. A. Frank, and J. D. Craven, On the Influx of Small Comets into the Earth's Upper Atmosphere I. (abstract), Eos Trans. AGU, 67, 299, 1986.

30. Sigwarth, J. B., L. A. Frank, and J. D. Craven, Latitudinal and Longitudinal Distribution of Atmospheric Holes Associated with Meteors (abstract), Eos Trans. AGU, 66, 1005, 1985.

31. Sigwarth, J. B., L. A. Frank, and J. D. Craven, Asymmetric Distribution of Atmospheric Holes Possibly Associated with Meteors (abstract), Eos Trans. AGU, 65, 1029, 1984.

32. Sigwarth, J. B., L. A. Frank, and J. D. Craven, Atmospheric Holes Possibly Associated with Meteors (abstract), Eos Trans. AGU, 64, 281, 1983.

33. Sigwarth, J. B., L. A. Frank, and J. D. Craven, Production and Characteristics of Atmospheric Holes Possibly Associated with Meteors (abstract), Eos Trans. AGU, 64, 784, 1983.