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• W2018586496 abstract "The substorm onset region and the radial development of the tail current disruption are examined from a new viewpoint. The reconfiguration of the magnetotail field at substorm onset can be understood in terms of a sudden decrease (disruption) in tail current intensity. The north-south component (BZ) is very sensitive to whether the spacecraft position is earthward or tailward of the disruption region, while the change in the Sun-Earth component (BX) is most sensitive to the change in tail current intensity near the spacecraft. If the current disruption starts in a localized range of radial distance and expands radially, a distinctive phase relationship between the changes in BX and BZ is expected to be observed. This phase relationship depends on whether the current disruption starts on the earthward side or the tailward side of the spacecraft. Thus it is possible to infer the direction of the radial expansion of the current disruption from magnetic field data of a single spacecraft. This method is applied to ISEE observations of a tail reconfiguration event that occurred on March 6, 1979. The phase relationship indicates that the disruption region expanded tailward from the earthward side of the spacecraft during the event. This model prediction is consistent with the time lag of magnetic signatures observed by the two ISEE spacecraft. The expansion velocity is estimated at 2 RE/min (∼200 km/s) for this event. Furthermore, it is found that the observed magnetic signatures can be reproduced to a good approximation by a simple geometrical model of the current disruption. The method is used statistically for 13 events selected from the ISEE magnetometer data. It is found that the current disruption usually starts in the near-Earth magnetotail (|X| < 20RE and often within 15 RE of the Earth. The phase relationship between BX and BZ is discussed in terms of the near-Earth neutral line model, and the result is compared with previous studies on the substorm onset region." @default.
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• W2018586496 date "1992-03-01" @default.
• W2018586496 modified "2023-09-25" @default.
• W2018586496 title "Radial expansion of the tail current disruption during substorms: A new approach to the substorm onset region" @default.
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• W2018586496 doi "https://doi.org/10.1029/91ja02470" @default.
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