Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31a0742l&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM31A-0742
Other
2731 Magnetosphere: Outer, 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms
Scientific paper
We examined substorm-related variations in the magnetic field at low-latitude stations and geostationary GOES satellites both for individual events and statistically. We found that the substorm effect in the magnetic field at low latitudes and geostationary orbit is opposite in the post-midnight and pre-midnight sectors: In the post-midnight sector, substorms are accompanied by positive variations in the magnetic field as expected from current wedge model, whereas in the pre-midnight sector they are accompanied by negative variations with the same or even larger amplitudes. A total decrease in the magnetic field after substorms as expected in the context of ring current formation is also observed, but this decrease on substorm time-scale is usually not so significant. We note that these results are in agreement with results of other authors but the unexpectedly high amplitudes of the negative variations in the magnetic field in the pre-midnight sector cannot be explained in the context of substorm current wedge model. This might be explained if substorms lead simultaneously not to one but two current wedges: the traditional current wedge in the near- and post-midnight sector and a second current wedge with oppositely directed currents in the pre-midnight sector.
Lyatsky Wladislav
Tan Aihong
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