Simulation of the prompt energization and transport of radiation belt particles during the March 24, 1991 SSC

Details Simulation of the prompt energization and transport of radiation belt particles during the March 24, 1991 SSC Simulation of the prompt energization and transport of radiation belt particles during the March 24, 1991 SSC

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2423l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 22, p. 2423-2426

Physics

Geophysics

135

Electric Fields, Electron Density (Concentration), Magnetic Fields, Magnetic Storms, Radiation Belts, Transport Theory, Computerized Simulation, Geophysics, Mathematical Models, Plasma Drift, Time Dependence

Scientific paper

We model the rapid (about 1 min) formation of a new electron radiation belt at L about or = 2.5 that resulted from the Storm Sudden Commencement (SSC) of March 24, 1991 as observed by the Combined Release and Radiation Effects Satellite (CRRES) satellite. Guided by the observed electric and magnetic fields, we represent the time-dependent magnetospheric electric field during the SSC by an asymmetric bipolar pulse that is associated with the compression and relaxation of the Earth's magnetic field. We follow the electrons using a relativistic guiding center code. The test-particle simulations show that electrons with energies of a few MeV at L greater than 6 were energized up to 40 MeV and transported to L about or = 2.5 during a fraction of their drift period. The energization process conserves the first adiabatic invariant and is enhanced due to resonance of the electron drift motion with the time-varying electric field. Our simulation results, with an initial W(exp -8) energy flux spectra, reproduce the observed electron drift echoes and show that the interplanetary shock impacted the magnetosphere between 1500 and 1800 MLT.

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