Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm31a..06l&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM31A-06
Other
2712 Electric Fields (2411), 2760 Plasma Convection (2463), 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The relationship between the partial ring current pressure peak and the electric potential structure is examined. The hot ion pressure tries to limits itself through the electric field associated with the ionospheric closure currents. To investigate this negative feedback of the stormtime ring current, simulation results for several magnetic storms are analyzed and then compared against IMAGE HENA data for a variety of energy channels. In addition, several set-up configurations of the kinetic ring current model are used to assess the influence of the numerical approach. It is found that the small-scale well-and-peak potential pairs, formed when magnetotail plasma is injected or convected in to the inner magnetosphere, significantly change the near-Earth plasma distribution. The main pressure peak is broken into smaller peaks and the flow pattern of the hot ions is altered. One consequence of this is that the pressure peak remains on the nightside rather than shifting towards dusk. Other effects include the creation of subauroral polarization streams and injection flow channels in the potential distributions at various times during the storm, formed when the small-scale electric field is locally aligned with the large-scale electric field. The small-scale structures are not particularly visible in the energetic neutral atom images, but the location of the simulated pressure peak is often closer to the observed location when this effect is included.
C:son Brandt Pontus
Kozyra Janet U.
Liemohn Michael W.
Ridley Aaron J.
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