Abstract
AbstractA fortuitous configuration of five Time History of Events and Macroscale Interactions during Substorms probes indicated that on 15 February 2008 between 04:00 and 11:00 UT a BZ dip with radial size of about 2.5 Earth radii (RE) and azimuthal size that could be as large as 10 RE was present for over 3 hr in the plasma sheet at XGSM ≈ −11 RE. Ballooning/InterChange Instability heads were observed at the tailward side of the dip with ∂BZ/∂X≈ −10 nT/RE. The Ballooning/InterChange Instability heads appeared to drift azimuthally toward dawn, in accord with particle‐in‐cell simulations of a charged current sheet. The signatures of the latter, for example, a finite average EZ directed toward the center of the plasma sheet, are verified by the Time History of Events and Macroscale Interactions during Substorms data.
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