Low-altitude Measurements of 2-6 MeV Electron Trapping Lifetimes at 1.5 < L < 2.5

Details Low-altitude Measurements of 2-6 MeV Electron Trapping Lifetimes at 1.5 < L < 2.5 Low-altitude Measurements of 2-6 MeV Electron Trapping Lifetimes at 1.5 < L < 2.5

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm12a..06b&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM12A-06

Other

2483 Wave/Particle Interactions (7867), 2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2768 Plasmasphere

Scientific paper

During the Halloween Storm period (October-November 2003), the Van Allen belt electron population was powerfully accelerated and re-established inward of its normal position. The new inner belt of electrons formed in this process decayed over a period of days to years. We have examined quantitatively the decay rates for electrons seen in the region of 1.5 < L <2.5 using SAMPEX satellite observations. We find that at L=1.5 the e- folding lifetime for 2-6 MeV electrons was τ~ 180 days. On the other hand, for the half-dozen distinct acceleration (or enhancement) events seen during late-2003 through 2005 at L~ 2.0, the lifetimes ranged from τ~ 8 days to τ~ 35 days. We compare these loss rates to those expected from prior observational and theoretical studies. We find that these lifetimes at L=2.0 are much shorter than the average 100-200 days that present theoretical estimates would suggest for the overall L=2 electron population. Additional wave-particle interaction aspects must be included in theoretical treatments. We describe such possibilities in this talk based on careful new analysis of particle scattering lifetimes at low L-values.

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