HR: 0830h
AN: SM11C-1166    [PDF]
TI: Dependence of the electric field in the inner magnetosphere on the IMF $B_Y$ component
AU: * Matsui, H
EM: hiroshi.matsui@unh.edu
AF: Space Science Center, University of New Hampshire, Morse Hall, Durham, NH 03824 United States
AU: Quinn, J M
EM: jack.quinn@unh.edu
AF: Space Science Center, University of New Hampshire, Morse Hall, Durham, NH 03824 United States
AU: Torbert, R B
EM: Roy.Torbert@unh.edu
AF: Space Science Center, University of New Hampshire, Morse Hall, Durham, NH 03824 United States
AU: Jordanova, V K
EM: vania.jordanova@unh.edu
AF: Space Science Center, University of New Hampshire, Morse Hall, Durham, NH 03824 United States
AU: Paschmann, G
EM: gep@mpe.mpg.de
AF: Max-Planck-Institut fuer extraterrestrische Physik, P.O.Box 1603, Garching, D-85740 Germany
AB: It is known that the electric field pattern at high-latitudes depends on the polarity of IMF $B_Y$. The potential cell at the duskside (dawnside) is larger than that at the other side for IMF $B_Y>0$ ($B_Y<0$) in the northern hemisphere. This asymmetry of the potential cell appears oppositely in the southern hemisphere. In this study we investigate the above problem by using the perigee data from Cluster passing through the magnetic equator. The data consist of both components of the electric field perpendicular to the magnetic field obtained by the electron drift instrument (EDI). These data are sorted by IMF $B_Y$ and discussed in terms of the seasonal variation of the orbits and the possible locations of the reconnection at the dayside magnetopause.
DE: 2712 Electric fields (2411)
DE: 2730 Magnetosphere--inner
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting