Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72b0622p&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM72B-0622
Physics
2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection, 2788 Storms And Substorms
Scientific paper
Recent MHD simulations of the storm-time magnetosphere and observations of the polar cap region have indicated that there is an apparent limit to the transpolar (cross-polar-cap) potential drop. At the same time, the potential across the magnetosphere is not known to saturate. This results in a phenomenon called differential convection which occurs when the trans-magnetospheric potential exceeds the transpolar potential when the latter is saturated. A necessary consequence of differential convection is the appearance of parallel potentials comparable to the difference between the potentials across the polar cap and magnetosphere. These parallel potentials can have a profound effect on the plasma population of the near-Earth magnetosphere, We have carried out a series of particle trajectory calculations to evaluate the effect of these parallel potentials on local ion distribution functions. To do so, we have used global snapshots of the magnetic and electric fields from the Integrated Space Weather Model (ISM) MHD simulation and launched distributions of ions from locations in the near-Earth magnetosphere and the auroral zone. Of particular interest are signatures in the ion precipitation pattern which may help pinpoint the location and intensity of the storm-time parallel potential drops in observations.
Peroomian Vahé
Siebert Keith D.
Siscoe George L.
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