Geosynchronous magnetic field temporal response to the solar wind and IMF variations

Details Geosynchronous magnetic field temporal response to the solar wind and IMF variations Geosynchronous magnetic field temporal response to the solar wind and IMF variations

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm51b..06w&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM51B-06

Physics

2708 Current Systems (2409), 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

We investigate the time-dependent response of the geosynchronous magnetic field to variations in the interplanetary magnetic field (IMF) orientation and sudden changes in the solar wind dynamic pressure. Because IMF discontinuities drape about the magnetopause, we expect the response to southward IMF turnings to occur nearly simultaneously over a wide range of local times. By contrast, the pressure variations launched by solar wind tangential discontinuities aligned with the spiral IMF into the magnetosheath should keep pace with the solar wind and generally strike the post-noon magnetopause first. Consistent with these predictions, we find that the magnetospheric magnetic field strength begins to diminish at all dayside local times within 4 to 5 min following the estimated arrival time of southward IMF turnings at the subsolar magnetopause, and that the nightside field begins to reconfigure within 12 min. By contrast, the response to pressure variations generally appears some 2.2 min after the arrival of the discontinuity in the noon-dusk sector, 4.4 min later in the noon-dawn sector, and 8.8 min later on the nightside.

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