Two magnetospheric substorms and the intensification of the second are caused by interplanetary magnetic field and ram pressure changes associated with a kinky heliospheric current sheet (KHCS). The responsible interplanetary features occur in a highly compressed region between a solar flare‐associated shock wave and the cold driver gas. The possbility that the interplanetary structure is a “magnetic cloud” is ruled out.
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Tsurutani et al. (1984) studied this question.
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