Generation of Pc 1 waves by the ion temperature anisotropy associated with fast shocks caused by sudden impulses

Details Generation of Pc 1 waves by the ion temperature anisotropy associated with fast shocks caused by sudden impulses Generation of Pc 1 waves by the ion temperature anisotropy associated with fast shocks caused by sudden impulses

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617897m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,897-17,901.

Physics

7

Geomagnetic Micropulsations, Ion Temperature, Magnetospheric Instability, Shock Waves, Earth Magnetosphere, Ion Cyclotron Radiation, Magnetic Compression, Plasma Compression, Pressure Pulses, Space Plasmas

Scientific paper

The high correlation of Pc 1 events with magnetospheric compressions is known. A mechanism is proposed which leads to the generation of Pc 1 waves. The interaction of a dynamic pressure pulse with the earth's bow shock leads to the formation of a weak fast-mode shock propagating into the magnetoshealth. The shock wave can pass right through a tangential discontinuity (magnetopause) and into the magnetosphere, without disturbing either of the structures. In a quasiperpendicular geometry, the shock wave exhibits anisotropic heating. This anisotropy drives unstable ion-cyclotron waves which can contribute to the generation of the Pc 1 waves which are detected. The viability of the mechanism is demonstrated with simulations. This mechanism could explain the peak in the occurrence of observed Pc 1 waves in the postnoon sector where a field-aligned discontinuity in the solar wind would most often be parallel to the magnetopause surface due to the average Parker-spiral magnetic-field configuration.

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