Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9913529k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A7, p. 13,529-13,535
Physics
6
Decay Rates, Electron Trajectories, Electrons, Geomagnetic Latitude, Magnetic Storms, Particle Diffusion, Radiation Belts, Crres (Satellite), Earth Magnetosphere, Energetic Particles
Scientific paper
A series of large magnetic storms during the March-June 1991 period produced major changes in energetic particle fluxes in the magnetosphere. The most significant change was the addition of a semidurable belt of extremely energetic particles (E(sub el) greater than 15 MeV and E(sub prot) greater than 40 MeV) at 2.2 less than L less than 2.5 after the late March magnetic storm. This belt slowly moved to lower L. The width of the belt at half-intensity remained constant at Delta L = 0.43 from 1 day after its formation through the end of the observations 6 months later. We have used data from the medium electrons A (MEA) and medium electrons B (MEB) particle spectrometers on CRRES to obtain cross-L motion rates for the fraction of these energetic particles that occur as a background effect in the MEA and in the MEB (greater than 6.5 MeV and greater than 1 MeV respectively). Cross-L motion rates for the first week after the storm sudden commencement of March 24, for the first month, and for the next 6 months have been obtained. The long- and short-term average rates of motion across L, approximately 6 x 10(exp -4) and approximately 3 x 10(exp -2) per day at L = 2.0 to 2.3, are similar to radial diffusion rates obtained from the distribution functions of fission electrons (Farley, 1969) and of relativistic electrons after a major magnetic storm (Tomassian et al., 1972). It is inferred from the constancy in width of the belt that radial diffusion proceeded predominantly toward lower L. The long-term apparent decay rate for the particle flux intensity as seen by these insturments is a simple exponential in time: N(sub t) = N(sub 0)e(exp k(1 - t/t(sub 0))), where k is 0.069.
Korth Alex
Vampola Alfred L.
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