Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13b1605m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM13B-1605
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2776] Magnetospheric Physics / Polar Cap Phenomena, [2778] Magnetospheric Physics / Ring Current
Scientific paper
The formation of the ring current has been attributed to two processes, enhanced magnetospheric convection and particle injection. The transpolar potential may be used as a proxy for magnetospheric convection so that enhanced transpolar potential indicates enhanced magnetospheric convection. Ring current response is measured by the SYM-H index. During large Y-component (By) Interplanetary Magnetic Field (IMF), the transpolar potential saturates as it does for large southward IMF. We will present evidence of this saturation in both observations and simulation results. During the same periods, the SYM-H index ranges in value, both positive and negative. No organized ring current response to the large polar cap potentials is evident in the data. We conclude that although large IMF By generates significant ionospheric convection, the magnetospheric counterpart is not effective at producing a ring current.
Allen Reeshemah
Lopez Robert E.
Lyon John
Mitchell Elizabeth J.
Whittlesey Phyllis
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