High-resolution spectra of 20-300 keV hard X-rays from electron precipitation over Antarctica

Details High-resolution spectra of 20-300 keV hard X-rays from electron precipitation over Antarctica High-resolution spectra of 20-300 keV hard X-rays from electron precipitation over Antarctica

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10019675s&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A10, p. 19675-19686

Physics

6

Ionosphere: Particle Precipitation, Magnetospheric Physics: Energetic Particles, Precipitating, Ionosphere: Instruments And Techniques, Ionosphere: Polar Cap Ionosphere

Scientific paper

In December 1990, a set of liquid-nitrogen-cooled germanium hard X-ray and gamma-ray spectrometers was flown aboard a high-altitude balloon from McMurdo, Antarctica, for solar, astrophysical, and terrestrial observations. This flight was the first circumnavigation (~9-day duration) of the Antarctic continent by a large (800,000-cubic-meter) balloon. Bremsstrahlung hard X-ray emission extending up to ~300 keV, from the precipitation of high-energy electrons, was observed on six separate occasions over the auroral zone, all during low geomagnetic activity (Kp<=2+).
All events were consistent with emission at the trapping boundary; observations over the polar cap showed no precipitation. We present the first high-resolution (ΔE~2 keV/full width at half maximum (FWHM) spectra of this hard X-ray emission in the energy range 20-300 keV. The observed count spectra are deconvolved by model-independent techniques to photon spectra and then the precipitating electron spectra. The spectral hardness shows an inverse relation with L as extremely effective in characterizing electron precipitation if coupled with imaging capability.

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