Temporal variation in the cross-polar-cap potential for periods of steady IMF as determined using SuperDARN.

Details Temporal variation in the cross-polar-cap potential for periods of steady IMF as determined using SuperDARN. Temporal variation in the cross-polar-cap potential for periods of steady IMF as determined using SuperDARN.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11c0443b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11C-0443

Physics

2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Observations of the cross-polar-cap potential and its variability are presented for several periods during the year of 2001. The periods were selected based upon having similar southward IMF values that were steady for extended periods. All of the periods had IMF Bz in the range of -2 nT to -10 nT, with values of By between +4 nT and -4nT. The ACE database was searched for all periods of greater than two-hours duration that met these criteria. Thirty-three such intervals were found for the year of 2001. High-latitude potential patterns were calculated from the SuperDARN data for each period and the cross-polar-cap potential was extracted from the patterns. Hence, a 160-hour database of cross-cap potentials with two-minute resolution was obtained. It was found that even when IMF conditions do not vary for long periods, the cross-cap potential shows substantial variability. The data were examined to determine the sources of the variability. In addition, correlation coefficients between the potential and various IMF and solar wind parameters are presented.

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