Physics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..984r&link_type=abstract
Geophysical Research Letters, vol. 8, Sept. 1981, p. 984-986.
Physics
22
Earth Magnetosphere, Geomagnetism, Magnetohydrodynamic Flow, Magnetosheath, Solar Terrestrial Interactions, Stagnation Point, Bow Waves, Mach Number, Magnetic Dipoles, Shock Wave Propagation, Solar Wind
Scientific paper
While observational and theoretical investigations have clearly indicated that the shape of the magnetosphere is very nearly symmetric about the plane determined by the aberrated solar wind flow direction and the earth's magnetic dipole, many processes such as magnetic pulsations and geomagnetic activity which should be shape dependent do not exhibit symmetry about this plane. The present paper proposes a solution to this apparent paradox in terms of the shifting of the stagnation point in the magnetosheath flow. It is shown that the interplanetary magnetic field can act to shift the stagnation point on the order of 15 deg from the nose towards dawn during periods of low Alfven Mach number without an appreciable aberration of the magnetopause, accounting for the observations of pulsation demarcation and magnetic reconnection.
Russell Christopher T.
Walker Ray J.
Zhuang H. C.
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