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

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/94GL02103· OSTI ID:70481
 [1]; ;  [2]; ; ; ;  [3];  [4]
  1. Nagoya Univ., Toyokawa (Japan)
  2. Univ. of Tokyo (Japan)
  3. Institute of Space and Astronautical Science, Sagamihara (Japan)
  4. Univ. of Iowa, Iowa City, IA (United States)
+ Show Author Affiliations
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. 17 refs., 4 figs., 1 tab.
OSTI ID:
70481
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 25 Vol. 21; ISSN GPRLAJ; ISSN 0094-8276
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
HELMHOLTZ INSTABILITY
MAGNETOPAUSE
SPATIAL DISTRIBUTION
VARIATIONS