High-latitude ionospheric response to a sudden impulse event during northward IMF conditions

Details High-latitude ionospheric response to a sudden impulse event during northward IMF conditions High-latitude ionospheric response to a sudden impulse event during northward IMF conditions

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105.2521m&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A2, p. 2521-2532

Physics

21

Ionosphere: Electric Fields, Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Ionospheric Dynamics, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

A high-density structure under northward interplanetary magnetic field BZ conditions is identified at the Wind and IMP 8 satellites, both in the solar wind on August 22, 1995. A compression of the magnetosphere is observed by the GOES 7 magnetometer within a few minutes of the pressure increase encountering the magnetopause. The response of the high-latitude ionosphere is analyzed on the basis of ground-based magnetometer data. A comprehensive description of this response in the Northern Hemisphere is provided by more than 70 ground magnetometers. This data set is interpreted in terms of high-latitude ionospheric potential patterns by means of the assimilative mapping of ionospheric electrodynamics technique. Convection cells in the polar cap are formed and disappear on minute timescales in accordance with previous results. However, the high-latitude ionospheric ground magnetic signature does not match the interpretation as events of traveling convection vortices, as has been suggested by past studies.

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