Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm34a..04l&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM34A-04
Physics
2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2731 Magnetosphere: Outer
Scientific paper
Energy spectra of electrons from 100 eV to 20keV and from 170keV to 340keV have been measured in the outer zone by a combination of electrostatic analyzers and solid state telescopes aboard the low-altitude (680km), polar-orbiting STSAT-1 (Science and Technology SATellite) satellite. With high accurate attitude control systems of the satellite and high sampling rate of the instrument, we have clearly identified precipitating electrons responsible for microbursts with durations of less than 1s. The data show that microburst precipitation occurs with uniform pitch angle distributions, and less particle fluxes and lower e-folding energy than those of quasi-trapped electrons. These observations support the idea that microbursts may due to the pitch angle scattering associated with wave-particle interaction in the equatorial region. There is evidence this mechanism is more effective for lower energy electrons.
Hwang Jungseek
Kim Hungsoo
Lee Edward
Lee Julian
McCarthy Martin
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