Quasi-periodic oscillations of the magnetopause during northward sheath magnetic field

Details Quasi-periodic oscillations of the magnetopause during northward sheath magnetic field Quasi-periodic oscillations of the magnetopause during northward sheath magnetic field

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2883k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2883-2886

Other

13

Diurnal Variations, Electric Fields, Interplanetary Magnetic Fields, Magnetopause, Periodic Variations, Plasma Oscillations, Plasma Sheaths, Satellite Observation, Solar Wind, Emission Spectra, Extremely Low Frequencies, Geophysical Satellites, Magnetohydrodynamic Flow, Plasma Density, Satellite-Borne Instruments, Solar Planetary Interactions

Scientific paper

The Geotail satellite quasi-periodically crossed the dawn flank of magnetopause more than ten times during an interval of 1.5 hours on November 4, 1992. Magnetopause crossings were characterized by quasi-periodic pulses of a sawtooth wave form in the magnetic field and the plasma flow components tangential to the magnetopause. The magnetic field strength in the magnetosheath was larger than that in the magnetosphere. The direction of magnetic field outside the magnetopause current layer was northward with antisunward tilt, indicating the draping of magnetic field on the magnetopause. Boundary normals of wavy magnetopause systematically incline sunward on the upstream side, while they tend to incline antisunward with considerable deviation on the downstream side. Comparison with other multiple crossing events suggests that the November 4 event exhibits wavy structure of the dawn flank magnetopause associated with the northward interplanetary magnetic field (IMF).

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