A new model for substorm onsets - The pre-breakup and triggering regimes

Details A new model for substorm onsets - The pre-breakup and triggering regimes A new model for substorm onsets - The pre-breakup and triggering regimes

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1279r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Oct. 1988, p. 1279-1282.

Physics

35

Ionospheric Currents, Magnetohydrodynamic Stability, Oxygen Ions, Plasma Layers, Polar Substorms, Space Plasmas, Field Aligned Currents, Hall Effect

Scientific paper

The prebreakup and triggering regimes for substorm onsets are discussed, using a model which explains why breakup has been observed as low as L = 5-6. It is suggested that the establishment of a coupled current structure within a single arc leads to the quasi-stable prebreakup regime. In the model, perturbation of the prebreakup structure leads to an instability criterion. Transitions from a stable to an unstable situation can trigger a rapid poleward expansion of the quiescent arc or substorm breakup. It is suggested that the kinetic energy of injected plasma from the magnetotail supplies the energy for breakup. It is predicted that a higher concentration of O(+) in the plasma sheet will permit breakup at low L values.

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