Physics
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.1791m&link_type=abstract
Journal of Geophysical Research, vol. 81, Apr. 1, 1976, p. 1791-1793. NSF-supported research;
Physics
5
Bow Waves, Geomagnetism, Magnetospheric Instability, Shock Waves, Solar Wind, Dynamic Models, Electrostatic Waves, Ionospheric Heating, Magnetic Field Configurations
Scientific paper
The thickness of magnetic structures associated with quasi-perpendicular bow shocks has been observed to vary over more than 2 orders of magnitude. In this paper, a criterion is employed which states that the magnetic structure of perpendicular shocks adjusts itself to keep electrostatic waves excited by the relative drift of electrons and ions at marginal stability. The marginal stability boundary and measured plasma parameters are used to calculate the expected thickness of bow-shock magnetic structures. The calculated and measured thicknesses are compared and found to be in good agreement over a range from less than 10 km to greater than 500 km. The conclusion is that the thickness of magnetic structures associated with quasi-perpendicular bow shocks is determined primarily by dissipation due to electron-ion streaming instabilities rather than by dispersive effects.
Greenstadt Eugene W.
Morse David L.
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