A comparison of specularly reflected gyrating ion orbits with observed shock foot thicknesses

Details A comparison of specularly reflected gyrating ion orbits with observed shock foot thicknesses A comparison of specularly reflected gyrating ion orbits with observed shock foot thicknesses

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.6824l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Aug. 1, 1984, p. 6824-6828.

Other

24

Bow Waves, Ion Motion, Magnetoplasmadynamics, Shock Waves, Specular Reflection, Field Strength, International Sun Earth Explorers, Laminar Flow, Mach Number, Space Plasmas, Supercritical Flow

Scientific paper

ISEE 1 and 2 flux gate magnetometer data has been used to measure the length or thickness of the 'foot' of 60 quasi-perpendicular supercritical bow shocks along the shock normal. These bow shock crossings are contrasted with 10 quasi-perpendicular subscritical shocks which do not exhibit the precursor foot. The extent of the foot structure is compared to the orbit of an ion having solar wind velocity and undergoing simple specular reflection about the shock normal. Good quantitative agreement between the measured value of the foot and the predicted value of about 0.7 ion gyroradii is evident. The foot thickness normalized to this predicted value is compared to the ratio of fast Mach number to critical fast Mach number. There is no dependence of the normalized foot thickness on Mach number other than at the transition point between subcritical and supercritical regimes. No dependence of the normalized foot thickness on upstream ion Beta is noted.

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