Statistical analysis of the sources of the cross-polar potential for southward IMF, based on particle precipitation characteristics

Details Statistical analysis of the sources of the cross-polar potential for southward IMF, based on particle precipitation characteristics Statistical analysis of the sources of the cross-polar potential for southward IMF, based on particle precipitation characteristics

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3508103s&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 8, CiteID L08103

Physics

2

Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Ionosphere: Particle Precipitation, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Plasma Convection (2463)

Scientific paper

There are several proposed physical processes which may contribute to the cross-polar potential and thus drive ionospheric convection around the polar caps. It is generally believed that magnetic reconnection is the dominant process, however dynamos such as viscous interaction and impulsive penetration are other possible contributors. A comprehensive statistical study has been conducted using data from the DMSP F13 satellite for passages along the northern hemisphere dawn-dusk meridian, with focus on typical two-cell convection patterns during times of steady southward IMF conditions. The results show that the low-latitude dynamo (viscous interaction or reconnection in the LLBL) on average accounts for only 1-2 kV of the total potential drop, values lower than those previously predicted. At rare occasions this dynamo can be a significant source of energy, however, contributing to more than 20 kV of the cross-polar potential.

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