The role of whistler oscillations in the formation of the structure of high Mach number collisionless shock

Details The role of whistler oscillations in the formation of the structure of high Mach number collisionless shock The role of whistler oscillations in the formation of the structure of high Mach number collisionless shock

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plap.work..165g&link_type=abstract

In ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1 p 165-171 (SEE N89-24910 18-75)

Astronomy and Astrophysics

Astrophysics

Collisionless Plasmas, Mach Number, Plasma Oscillations, Plasma Waves, Shock Wave Interaction, Whistlers, Shock Fronts, Solitary Waves, Supercritical Flow, Wave Packets

Scientific paper

It is shown that critical Mach number formation of the structure of the front of collisionless shock is concerned with nonlinear solitary wave packet of whistler oscillations. This critical Mach number is not the same as usually defined when ohmic dissipation alone cannot provide necessary dissipation. The consequences of this are that the gradients in the region of ramp are defined by dispersive length of the whistler oscillations; and maximum amplitude of the magnetic field is approximately of the order of value of the amplitude of the stationary points of the system of equations which describe the nonlinear waves. This provides a much larger number of the reflected ions and these ions formate foot region. Such a picture is variable because of the decay instability of the whistler waves and auto-oscillations of nonlinear whistler waves, because of the dependence of the number of reflected ions which produce the main part of dissipation from the maximum amplitude of overshoot.

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