Concerning possible effects of ionospheric conductivity upon the occurrence patterns of impulsive events in high-latitude ground magnetograms

Details Concerning possible effects of ionospheric conductivity upon the occurrence patterns of impulsive events in high-latitude ground magnetograms Concerning possible effects of ionospheric conductivity upon the occurrence patterns of impulsive events in high-latitude ground magnetograms

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10113407s&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A6, p. 13407-13412

Physics

10

Ionosphere: Auroral Ionosphere, Ionosphere: Current Systems, Ionosphere: Electric Fields, Ionosphere: Particle Precipitation

Scientific paper

Previous studies have interpreted the occurrence patterns of impulsive events in the high-latitude dayside ionosphere in terms of transient processes occurring near the dayside magnetopause. In particular, the fact that most impulsive ground magnetometer events occur prior to local noon has been interpreted as evidence for a dawn/dusk asymmetry in transient processes at the magnetopause. In this paper, we seek to raise the awareness of the community that the high-latitude distribution of the Hall conductivity also influences the signatures observed by ground magnetometers. In particular, we will show that impulsive event occurrence patterns bear a striking resemblance to reported statistical patterns for the Hall conductivity. We suggest that this similarity be taken into account when interpreting occurrence patterns for impulsive ground events.

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