Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa21a0293m&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA21A-0293
Physics
7954 Magnetic Storms (2788)
Scientific paper
The enhanced magnetospheric convection electric field and the substorm-induced electric fields are the drivers of plasma acceleration during geospace magnetic storms. The relative influence of the two drivers on the development of the storm-time ring current is the topic of this study. We use a three-dimensional dynamic ion-tracing model, to construct maps of the temporal and spatial variations of ion number densities in the inner magnetosphere. Outflowing ionospheric oxygen ions and protons are traced under two distinct scenarios: in the first case, we follow their transport and acceleration under the influence of a large convection electric field only. In the second case, an impulsive electric field is added due to magnetic field dipolarization, as observed by spacecraft during substorm expansion. Plasma sheet particles are also traced under the above conditions. According to this study the inclusion of substorm-induced electric fields renders ion acceleration much more efficiently. The difference in energization is much more prominent for O+ ions, which have been observed to be preferentially accelerated by substorm-induced electric fields. For both ion species large-scale magnetospheric convection alone is not sufficient to accelerate these particles to ring current energies.
Daglis Ioannis A.
Delcourt Dominique C.
Metallinou A. F.
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