Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32a1146n&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM32A-1146
Physics
2708 Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms
Scientific paper
Mid-latitude east-west geomagnetic disturbances on the nightside are attributed to field-aligned currents at high-latitudes. In order to discuss storm-time variations in field-aligned currents on the nightside, we examined east-west geomagnetic disturbance fields at mid-latitudes on the nightside for some geomagnetic storms. The results indicate that upward field-aligned currents are developed on the nightside (esp. in the post-midnight) under the condition that the interplanetary magnetic field (IMF) is directed southward. It is also suggested that substorm expansions have a secondary effect on the upward field-aligned currents on the nightside. We will discuss some possible mechanisms of substorms on the upward currents in the post-midnight.
Iyemori Toshihiko
Nakano Satoshi
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