Steepening of kinetic magnetosonic waves into shocklets - Simulations and consequences for planetary shocks and comets

Details Steepening of kinetic magnetosonic waves into shocklets - Simulations and consequences for planetary shocks and comets Steepening of kinetic magnetosonic waves into shocklets - Simulations and consequences for planetary shocks and comets

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2281o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2281-2300.

Physics

86

Bow Waves, Giacobini-Zinner Comet, Linear Polarization, Magnetosonic Resonance, Shock Waves, Solar Planetary Interactions, Electromagnetic Radiation, Polarization (Waves), Solar Wind Velocity, Wave Packets, Whistlers, Planets, Comets, Magnetosphere, Shock Waves, Kinetics, Simulations, Numerical Methods, Electromagnetic Waves, Evolution, Frequencies, Giacobini-Zinner, Bow Shock, Upstream, Polarization, Amplitude, Procedure, Whistlers, Solar Wind, Models, Diagrams, Magnetic Field, Theoretical Studies, Analysi

Scientific paper

The generation and the nonlinear evolution of oblique low-frequency electromagnetic (kinetic magnetosonic) waves which were observed upstream of planetary bow shocks and at the Giacobini-Zinner comet, and referred to as shocklets, were investigated using an electromagnetic hybrid code. The observations show that the waves, which have a sinusoidal form when their amplitude is small, become steepened and linearly polarized as they grow in amplitude. The results of simulations show the original small-amplitude elliptically polarized wave grows and steepens, so that its polarization changes and becomes somewhat linear. The steepening process is associated with the coherent generation of a broad spectrum of waves on the magnetosonic whistler branch, which propagate at various phase and group velocities. It is shown that the presence of shocklets upstream of a planetary bow shock can modify its local structure by changing the solar wind Mach number and temperature, or by colliding with the shock.

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