Abstract
Response of the outer plasma sheet region to the substorm development on November 13, 1996 was studied with the plasma and magnetic field measurements obtained from INTERBALL-1 and GEOTAIL. In addition, the data from INTERBALL-2, LANL-080, -084 spacecraft and from Scandinavian and Siberian ground stations were used for the sub-storm timing. The solar wind and IMF which have been monitored by WIND spacecraft were rather variable during the early growth phase, but the remaining part of the growth phase as well as the expansion phase have been developed under stable southward IMF and relatively stable solar wind pressure. Few unusual features of substorm evolution have been revealed in our study. Measurements in the tail lobes and plasma sheet periphery during the growth phase showed that its behaviour differs from a classical scheme. Consideration of the total pressure behaviour during the substorm at distances 22 and 27.5 R E revealed cross-tail current substorm dynamics during the expansion phase. We concluded that current disruption impulsively propagated toward the tail from the near Earth plasma sheet region in accordance with the discrete character of the substorm development. In the course of the substorm the signatures of tailward propagating plasmoid were observed at northern and southern parts of the plasma sheet first by INTERBALL-1 (at 28 R E ) and later by GEOTAIL (at 22 R E ). Time delay in the registration of the plasmoid at two sides is hard to explain assuming the existence of only one plasmoid. This anomaly might be explained suggesting the asymmetric multiple plasmoid structure or (which is less probable) as signatures of completely different plasmoids. During the late expansion phase despite the enhanced convection at the dayside magnetosphere, the effective dissipation of energy in the disrupting current sheet resulted in the magnetotail collapse and in the plasma mantle approach to the INTERBALL-1 position.
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Borodkova, N.L. et al. (1999). Multi-Point Substorm Observations of the Outer Plasma Sheet Dynamics on November 13, 1996. In: Sibeck, D.G., Kudela, K. (eds) Interball in the ISTP Program. NATO Science Series, vol 537. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4487-2_2
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DOI: https://doi.org/10.1007/978-94-011-4487-2_2
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