ISEE 1 and 2 observation of the oscillating magnetopause

Details ISEE 1 and 2 observation of the oscillating magnetopause ISEE 1 and 2 observation of the oscillating magnetopause

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..744s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Aug. 1988, p. 744-747.

Physics

86

Interplanetary Magnetic Fields, Magnetopause, Magnetospheric Instability, Plasma Oscillations, Space Plasmas, International Sun Earth Explorers, Kelvin-Helmholtz Instability, Magnetic Measurement, Solar Position

Scientific paper

The ISEE 1 and 2 magnetometer data for 10 years between October 1977 and September 1987 were used to identify magnetopause crossings that occurred in this period in the northward, horizontal, and southward IMFs and to determine the dependence of the oscillation amplitude of surface waves with periods greater than about 2 min on latitude, local time, and the direction of the IMF. The IMP 8 and ISEE 3 data were used to determine the IMF in the geocentric solar magnetosphere coordinates during the crossings. More than 1000 magnetopause passes were identified, with half of them with multiple crossings. The number of crossings per pass and the inferred average amplitude of the oscillation under southward conditions were nearly three times higher than under northward conditions. The amplitude increased with increasing angle from the subsolar point, when under southward, but not when under northward, conditions. The results suggest that the Kelvin-Helmholtz instability plays a very minor role in causing the surface waves on the dayside magnetopause.

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