AbstractWe analyze the magnetic structures in the near-tail at Xgsm=−17.5Re on September 19, 2003 by Cluster. During the course of a substorm event, the earthward propagating plasmoid and flux ropes in the near-tail are observed. The earthward propagating plasmoid is associated with the bipolar Bz and By signatures. The two flux ropes are embedded within the earthward plasma flows, which might be referred to the population as ‘‘BBF-type’’ flux ropes. The first flux rope diameter is about 0.7Re and duration based upon the Bz signature is ∼20s, while the second one diameter is about 1.4Re and duration is ∼30s. The earthward propagating plasmoid and flux ropes could have influence upon the dipolarization and injection in inner magnetosphere. The Cluster observations of earthward propagating plasmoid and flux ropes can be interpreted as strong evidence for multiple X-lines. Our observations are consistent with that multiple plasmoids or flux ropes are formed repeatedly and ejected tailward in the course of geomagnetically active time.
Cluster observations of earthward propagating plasmoid and flux ropes in the near-tail during the course of a substorm event
Advances in Space Research ; 43 , 9 ; 1337-1342
2008-12-19
6 pages
Article (Journal)
Electronic Resource
English
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