Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42a0831l&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM42A-0831
Physics
2700 Magnetospheric Physics, 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2778 Ring Current, 2788 Storms And Substorms
Scientific paper
We simulate electron transport in order to examine the stormtime injection of electrons to the ring current. We use the same method and magnetic and electric field model that has been previously used to account for the stormtime injection of ring current ions, to determine the extent to which that model can also account for observed stormtime electron injections. The model traces the guiding-center motion of representative particles, having selected first adiabatic invariants μ , in response to a series of impulsive enhancements in the convection electric field. The magnetic field model is a dipole field plus constant southward IMF. Over this magnetic field model we impose corotation and a 25-kV quiescent Stern-Volland cross polar cap potential. We model a storm by applying an additional enhanced impulsive cross polar cap potential that is less well shielded than the Stern-Volland potential. The average enhancement of this storm-associated potential is 125 kV, and lasts for 6 hours. We performed simulations for representative equatorially-mirroring electrons for μ = 1 MeV/G to 200 MeV/G. Using the simulation results, we map stormtime phase space distributions by invoking Liouville's Theorem modified by losses. We consider electron loss due to precipitation via a model having a MLT-dependent loss rate that is less than strong everywhere in the plasma sheet. We also look at a model with strong diffusion losses within the plasma sheet. We apply a boundary spectrum at geosynchronous orbit that is based on averaging 12 years of geosynchronous LANL/MPA electron data and is parameterized by Kp and binned in 0.5 hr MLT increments. The initial quiescent electron distribution for trapped electrons is taken from the steady-state balance between radial diffusion and weak-pitch-angle-scattering losses. From the simulation results, we find significant stormtime enhancements of ring current electrons at equatorial radial distance r = 2.6 to 6.6 RE for energies from tens of keV up to 180 keV. We compare qualitatively features of our stormtime electron flux distribution with previously published observations of ring current electron distributions.
Albert Jay M.
Chen Margaret W.
Korth Haje
Liu Shujuan
Lyons Larry R.
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