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An attempt is made to\ud search for a critical condition in the lobe magnetic field to initiate\ud large-scale magnetic field changes associated with substorm expansions. Using\ud data from ISEE-1 for 1978, sudden decreases in the lobe magnetic field\ud accompanied by magnetic field dipolarizations are identified. In this study,\ud such events are designated as the magnetotail deflation. The magnetic field\ud component parallel to the equatorial plane, BE , is normalized to a\ud fixed geocentric distance, BEN , and is corrected for the\ud compression effect of the solar wind dynamic pres-sure, BENC . It is\ud shown that the BENC value just prior to a magnetotail deflation\ud correlates well with the Dst index; BENC = 37.5 - 0.217 Dst0,\ud where Dst0 denotes the Dst value corrected for the\ud solar wind dynamic pressure. This regression function appears to delineate the\ud upper limit of BENC values, when they are sorted by the Dst0\ud index. On the basis of this finding it is suggested that a prerequisite\ud condition for magnetotail deflations must exist in the magnetosphere. Key words. Magnetospheric physics (magnetotail;\ud current systems; storms and substorms

Substorm-associated large-scale magnetic field changes in the magnetotail: a prerequisite for &quot;magnetotail deflation&quot; events

Substorm-associated large-scale magnetic field changes in the magnetotail: a prerequisite for "magnetotail deflation" events