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Quasi‐periodic oscillations of the magnetopause during northward sheath magnetic field
Author(s) -
Kokubun S.,
Kawano H.,
Nakamura M.,
Yamamoto T.,
Tsuruda K.,
Hayakawa H.,
Matsuoka A.,
Frank L. A.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl02103
Subject(s) - magnetopause , magnetosheath , geophysics , magnetosphere , physics , interplanetary magnetic field , magnetic field , solar wind , computational physics , geology , quantum mechanics
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.