Trapped Electron Lifetimes in the Inner Magnetosphere

Details Trapped Electron Lifetimes in the Inner Magnetosphere Trapped Electron Lifetimes in the Inner Magnetosphere

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm34a..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM34A-01

Physics

2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner

Scientific paper

Some geomagnetic storms increase the trapped electron intensity in the slot and inner radiation belt. Man- made events such as the high-altitude nuclear tests of the late 1960's also were found to inject new and intense populations of electrons in the inner magnetosphere. In both cases, spacecraft measurements of the change in the trapped electron intensity observed in low-Earth orbit or at higher altitudes have been clues to the loss processes at work. The nuclear tests provided a known injection time and showed that the typical lifetime for ~0.5 MeV electrons was peaked at about 1 year inside an L-shell of ~1.6 and dropped to only a few days outside L~2. Pitch-angle scattering by VLF transmitter waves is sufficiently strong to be the dominant source for the change in the lifetime at the outer edge of the inner radiation belt. In this paper we revisit the determination of the L-shell dependence of electron lifetime using recent measurements from low-Earth orbit and higher altitudes. In particular, long-baseline measurements from missions such as NASA/SAMPEX and NOAA/POES allow for the determination of decay rates versus L in many intense electron injections. We will compare these recent measurements with those made in the past and with models that include multiple scattering mechanisms. This work was supported under The Aerospace Corporation's Independent Research and Development Program.

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