Correlated dynamics of the tail and the ionosphere related with energy transfer between the solar wind and the magnetosphere

Details Correlated dynamics of the tail and the ionosphere related with energy transfer between the solar wind and the magnetosphere Correlated dynamics of the tail and the ionosphere related with energy transfer between the solar wind and the magnetosphere

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13...37j&link_type=abstract

Advances in Space Research, Volume 13, Issue 4, p. 37-40.

Physics

Scientific paper

A remote sensing study of the dynamics of the cross-tail current has been performed using ISEE magnetic field data during a 12 hour period when these spacecraft were in the tail lobe. IMP-8 data taken simultaneously in the interplanetary medium showed that the solar wind was continuously supplying power to the magnetosphere. On a global scale the magnetosphere responded directly as evidenced by the good general correlation between the auroral electrojets and the IMF. A detailed study of the ISEE and ground magnetic fields reveals the occurrence of four successive main cross-tail current disruptions associated with substorm onsets. As a general trend, each disruption was followed by a cross-tail current increase while in the meantime the intensity of the auroral electrojet decreased. A new substorm started when the cross-tail current again reached a high value and when the polar ionosphere relaxed towards the ``quiet state''. These observations also apply to the last substorm of the series which coincides with a northward turning of the IMF. These results strongly support a cross-tail current threshold instability as the main cause of auroral substorms.

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