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Ho & Tsurutani 1995
Ho, C.M. and Tsurutani, B.T. (1995). Distant tail plasma jetting and Bz properties at slow-mode shocks: A model of reconnection during northward IMFs. Geophysical Research Letters 22: doi: 10.1029/95GL02794. issn: 0094-8276.

Previous distant geotail studies find a difference in the locations where the plasma flow reverses direction (x≈-120 Re) and where the magnetic field Bz reverses (x≈-200 Re). These results raise some questions about the standard Petchek reconnection model and its applicability. In this study, we use 66 slow-mode shock events to study the flow properties both earthward and tailward of the x-type neutral line. The location of the neutral line relative to the spacecraft is determined by: a) use of the measured slow-mode shock orientation, and b) the magnetic Bz polarity. We find that plasmasheet flow speeds downstream of slow shocks are similar, using either of the above two methods. On average, for events tailward of the neutral line, the tailward flow speed is statistically higher than for earthward cases by ~100--150 km/s. This is consistent with magnetic reconnection where jetting plasma flows of 50--75 km/s are superposed on top of a more-or-less continuous high speed tailward convection flow of ~600 km/s. By examining the relationship between these slow shock events in the distant tail and upstream IMF orientations, we also find that a significant amount (40%) of slow shock events occurs during northward IMFs. Thus, we propose a distant tail model of reconnection during northward IMF periods. Using this model and the standard substorm reconnection model (southward IMF cases), we believe we can explain all observations in this paper. ¿ American Geophysical Union 1995

BACKGROUND DATA FILES

Abstract

Keywords
Magnetospheric Physics, Magnetotail, Magnetospheric Physics, Plasma sheet, Space Plasma Physics, Magnetic reconnection
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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