Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm62a06s&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM62A-06
Physics
2407 Auroral Ionosphere (2704), 2744 Magnetotail, 2788 Storms And Substorms
Scientific paper
Earlier studies of earthward flow bursts, or "bursty bulk flows", in the plasma sheet have established their large scale properties and major role in the transport of energy and magnetic flux to the inner magnetosphere during substorms. In examining Geotail observations of the magnetic fields embedded in these high speed earthward flows we have found that they sometimes include nearly force-free flux ropes closely resembling the plasmoids ejected down the tail, but with their direction of motion and the Bz signatures reversed. Here we present examples of these reverse plasmoids observed by Geotail on January 27, 1996 and February 14, 1998 and analyze their basic properties. Our results will be compared with the previous measurements of flux ropes in this region by ISEE 1 & 2 and related to the observation of "south/north" traveling compression regions in the tail. Finally, the implications of reverse plasmoids for the nature of the reconnection process in the near-tail will be discussed.
Fairfield Donald H.
Hesse Matthias
Ieda A.
Lepping Ronald P.
Mist R.
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