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2002
Authors: Millan R M
Title: X-ray observations of MeV electron precipitation with a balloon-borne germanium spectrometer
Abstract: The high-resolution germanium detector aboard the MAXIS (MeV Auroral X-ray Imaging and Spectroscopy) balloon payload detected nine X-ray bursts with significant flux extending above 0.5 MeV during an 18 day flight over Antarctica. These minutes-to-hours-long events are characterized by an extremely flat spectrum (∼E−2) similar to the first MeV event discovered in 1996, indicating that the bulk of parent precipitating electrons is at relativistic energies. The MeV bursts were detected between magnetic latitudes 58°–68° (L-values of 3.8–6.7) but only in the late afternoon/dusk sectors (14:30–00:00 MLT), suggesting scattering by EMIC (electromagnetic ion cyclotron) waves as a precipitation mechanism. We estimate the average flux of precipitating E ≥ 0.5 MeV electrons to be ∼36. . .
Date: 12/2002 Publisher: Geophysical Research Letters DOI: 10.1029/2002GL015922 Available at: http://onlinelibrary.wiley.com/doi/10.1029/2002GL015922/full
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