A cross-field current instability for substorm expansions

Details A cross-field current instability for substorm expansions A cross-field current instability for substorm expansions

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611389l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,389-11,401.

Physics

147

Magnetospheric Instability, Plasma Currents, Polar Substorms, Auroral Electrojets, Geomagnetic Tail, Magnetosphere-Ionosphere Coupling

Scientific paper

An analysis is presented which suggests a cross-field current instability as a possible mechanism for substorm onsets based on numerical solutions of an appropriate dispersion equation. The results show that the neutral sheet is indeed unstable under such a condition. The obtained growth rate is comparable to the observed time scale for substorm onset. Excited waves typically have a significant electromagnetic component and over a broad frequency band. A substorm onset scenario is constructed, and a qualitative explanation is given for a number of substorm features, including pseudobreakups, spatially limited substorm initiation regions, solar wind conditions for triggering substorms, local time skew in the onset location, different acceleration characteristics between ions and electrons, and tailward and local time spreading of the disruption disturbance.

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