The earth's magnetosphere under continued forcing - Substorm activity during the passage of an interplanetary magnetic cloud

Details The earth's magnetosphere under continued forcing - Substorm activity during the passage of an interplanetary magnetic cloud The earth's magnetosphere under continued forcing - Substorm activity during the passage of an interplanetary magnetic cloud

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7657f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A5, p. 7657-7671.

Physics

Plasma Physics

83

Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Effects, Magnetic Field Configurations, Magnetic Storms, Polar Substorms, Dynamic Models, Plasma Physics, Radar Tracking

Scientific paper

Magnetic field and energetic particle observations from six spacecraft in the near-earth magnetotail are described and combined with ground magnetograms to document for the first time the magnetospheric substorm activity during a 30-hour long transit of an interplanetary cloud at 1 AU. During an earlier 11-hr interval when B(z) was continuously positive, the magnetosphere was quiescent, while in a later 18-hr interval when B(z) was uninterruptedly negative a large magnetic storm was set off. In the latter interval the substorm onsets recurred on average every 50 min. Their average recurrence frequency remained relatively undiminished even when the magnetic cloud B(z) and other measures of the interplanetary energy input decreased considerably. These results concur with current models of magnetospheric substorms based on deterministic nonlinear dynamics. The substorm onset occurred when the cloud's magnetic field had a persistent northward component but was predominantly westward pointing.

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