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Detailed Reference Information |
Taguchi, S., Kiyohara, M., Mukai, T., Yamamoto, T., Nose, M., Saito, Y. and Kokubun, S. (1998). Geotail observations of north-south plasma velocity enhancements in the lobe near substorm expansion phase onset. Geophysical Research Letters 25: doi: 10.1029/1998GL900132. issn: 0094-8276. |
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This paper reports on the enhancement of the lobe plasma velocity towards the neutral sheet. Analyzing the Geotail plasma and magnetic field data in the lobes earthward of X=-45 RE, we identified 30 events of several-minute magnetic field increase-and-decrease during which the field tilts only southward; that is, the BZ variation is unipolar. For most of these events, we found that the lobe plasma velocity towards the neutral sheet is enhanced and peaked around the most southward tilting of the field. The average of the peak magnitude is about 130 km/s in a plane perpendicular to the magnetic field. For each case, this magnitude is roughly 1--10% of the lobe Alfven speed. We interpret the velocity enhancement having these characteristics as signatures of the transition from plasma sheet reconnection to lobe reconnection at the near-Earth neutral line. ¿ 1998 American Geophysical Union |
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Abstract |
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Keywords
Magnetospheric Physics, Magnetotail, Magnetospheric Physics, Storms and substorms, Magnetospheric Physics, Plasma sheet, Space Plasma Physics, Magnetic reconnection, Magnetospheric Physics, Numerical modeling |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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