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A global two-dimensional simulation of a substormlike process occurring in Earth's magnetosphere is presented. The results are consistent with an empirical substorm model---the neutral-line model. Specifically, the introduction of a southward inter-planetary magnetic field forms an open magnetosphere. Subsequently, a substorm neutral line forms 15 R₄ in the magnetotail, and plasma sheet thinning and plasma acceleration occur. Eventually the substorm neutral line moves tailward toward its presubstorm position.
Lyon et al. (Mon,) studied this question.
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