Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm22b..01h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM22B-01
Physics
Plasma Physics
[7845] Space Plasma Physics / Particle Acceleration
Scientific paper
Both a prompt increase and decrease of outer zone electron fluxes have been observed due to CME-shock driven geomagnetic storms, at times faster than convective buildup of the ring current, which produces radial losses when combined with inward motion of the magnetopause. Several storms around the last solar maximum are examined using the LFM-MHD code to compute internal magnetospheric E and B fields from upstream solar wind parameters, combined with a 3D guiding center test particle code to examine: 1) radial transport and 2) enhanced precipitation losses into the atmosphere. Inward radial transport increases flux at a given energy and L value, while outward radial transport to the inward moving magnetopause produces loss, along with enhanced losses to the atmosphere. On the longer time scale of a storm, including buildup of the ring current, additional radial losses result from fully adiabatic and diffusive transport. Enhanced ULF wave activity can produce both coherent and diffusive transport and energy exchange with electrons in drift resonance with azimuthally propagating ULF waves. Coherent transport and energization can occur at a rate which exceeds nominal radial diffusion estimates but is slower than prompt injection on a drift time scale. Precipitation losses for the January 20, 2005 storm occur on the time scale of magnetosonic impulse propagation through the magnetosphere, following arrival of a CME-shock, much faster than the time scale for build up of the ring current and enhanced EMIC wave precipitation losses. The balance between enhanced and decreased phase space density when losses are included will be examined, along with a CIR-driven storm comparison, which can produce sustained electron flux increases exceeding those of CME-driven storms.
Brito T.
Elkington Scot R.
Hudson Mary K.
Kress B.
Li Zaidong
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