Upstream waves, shocklets, short large-amplitude magnetic structures and the cyclic behavior of oblique quasi-parallel collisionless shocks

Details Upstream waves, shocklets, short large-amplitude magnetic structures and the cyclic behavior of oblique quasi-parallel collisionless shocks Upstream waves, shocklets, short large-amplitude magnetic structures and the cyclic behavior of oblique quasi-parallel collisionless shocks

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98...47s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A1, p. 47-57.

Physics

53

Collisionless Plasmas, Ion Beams, Magnetic Field Configurations, Magnetohydrodynamic Stability, Oblique Shock Waves, Beam Plasma Amplifiers, Computerized Simulation, Nonlinear Evolution Equations, Plasma Density

Scientific paper

Numerical simulations of oblique quasi-parallel shocks are performed, and it is shown that several previously proposed mechanisms can explain the reformation cycles of the shocks. It is shown instead that upstream low-frequency waves steepen upstream of the shock ramp in the absence of a well-defined specularly reflected ion beam. Interface instability and a whistler wave interaction scenario play no major role. A strong gradient of diffuse ions is found upstream of the shock ramp with a length scale of the same order of magnitude as the wavelength of the upstream waves. The latter are due to a resonant ion/ion beam instability between incident and diffuse ions, the latter representing a hot beam. The increase in the exponential diffuse ion density toward the shock leads to a dramatic steepening of the wave which becomes a pulsationlike structure and ultimately comprises the shock.

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