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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 10/11
Ann. Geophys., 12, 1018–1021, 1994
https://doi.org/10.1007/s00585-994-1018-z
© European Geosciences Union 1994
Ann. Geophys., 12, 1018–1021, 1994
https://doi.org/10.1007/s00585-994-1018-z
© European Geosciences Union 1994

  31 Aug 1994

31 Aug 1994

Guided waves in the plasma sheet and triggering of a substorm

V. V. Safargaleev and V. B. Lyatsky V. V. Safargaleev and V. B. Lyatsky

Abstract. A guided propagation of magnetoacoustic wave in the plasma sheet located between two lobes of the magnetotail is investigated. The dispersion equation for the wave and equation connecting a disturbance of plasma pressure inside the plasma sheet and amplitude of the plasma sheet boundary oscillations are obtained. For some value of plasma pressure disturbance, the displacement of the plasma sheet boundaries becomes of order of the half-thickness of the plasma sheet. In the case of symmetrical oscillations of the boundaries ("sausage-like" mode), it creates the favourable conditions for reconnection of the magnetic field lines in the magnetotail and may lead to triggering of a substorm. The magnetoacoustic wave may be generated by sudden impulse of the solar wind plasma pressure.

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