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

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3420110b&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 20, CiteID L20110

Physics

7

Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Energetic Particles: Trapped, Magnetospheric Physics: Ring Current

Scientific paper

During the Halloween Storm period (October-November 2003), a new Van Allen belt electron population was powerfully accelerated. The 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. 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 studies. We find that 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 and we describe such possibilities here.

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