Kelvin-Helmholtz instability and the variation of geomagnetic pulsation activity

Details Kelvin-Helmholtz instability and the variation of geomagnetic pulsation activity Kelvin-Helmholtz instability and the variation of geomagnetic pulsation activity

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..777l&link_type=abstract

Geophysical Research Letters, vol. 7, Oct. 1980, p. 777-780.

Physics

7

Geomagnetic Micropulsations, Kelvin-Helmholtz Instability, Magnetic Storms, Magnetospheric Instability, Bow Waves, Interplanetary Magnetic Fields, Magnetosheath, Solar Wind Velocity, Time Response

Scientific paper

It is shown that the observed local time variation of dayside geomagnetic micropulsations is consistent with the Kelvin-Helmholtz generation mechanism operating at the magnetopause. The variation of the angle between the interplanetary magnetic field and the magnetopause around the magnetosphere causes variations in the magnetosheath magnetic field, which in turn lead to local time variations in micropulsation amplitudes. Morning sector pulsations are expected to be larger than afternoon sector pulsations. Furthermore, large-amplitude pulsations are expected to be more frequently observed when the angle between the interplanetary magnetic field and the solar wind velocity in front of the bow shock is small.

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