Magnetosheath density fluctuations and magnetopause motion
作者:
D. G. Sibeck,
J. T. Gosling,
期刊:
Journal of Geophysical Research: Space Physics
(WILEY Available online 1996)
卷期:
Volume 101,
issue A1
页码: 31-40
ISSN:0148-0227
年代: 1996
DOI:10.1029/95JA03141
数据来源: WILEY
摘要:
The interplanetary magnetic field (IMF) orientation controls foreshock densities and modulates the fraction of the solar wind dynamic pressure applied to the magnetosphere. Such pressure variations produce bow shock and magnetopause motion and cause the radial profiles for various magnetosheath parameters to sweep inward and outward past nearly stationary satellites. We report ISEE 2 observations of correlated density and speed fluctuations, and anticorrelated density and temperature fluctuations, on an outbound pass through the northern dawnside magnetosheath. Densities decreased when the magnetic field rotated southward and draped about the magnetopause. In the absence of any significant solar wind density or dynamic pressure variations, we interpret the magnetosheath fluctuations as evidence for radial magnetosheath motion induced by variations in the IMF orientation.
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