HR: 1330h
AN: SM32A-1146    [PDF]
TI: Effects of the interplanetary magnetic field and substorms on nightside upward field-aligned currents during storm-time inferred from geomagnetic data at mid-latitudes
AU: * Nakano, S
EM: shiny@kugi.kyoto-u.ac.jp
AF: Graduate School of Science, Kyoto University, Department of Geophysics, 4-gokan, Graduate Scool of Science, Kyoto University, Kyoto, 606-8502 Japan
AU: Iyemori, T
EM: iyemori@kugi.kyoto-u.ac.jp
AF: Graduate School of Science, Kyoto University, Department of Geophysics, 4-gokan, Graduate Scool of Science, Kyoto University, Kyoto, 606-8502 Japan
AB: 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.
DE: 2708 Current systems (2409)
DE: 2736 Magnetosphere/ionosphere interactions
DE: 2788 Storms and substorms
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting