Steepening of parallel propagating hydromagnetic waves into magnetic pulsations - A simulation study

Details Steepening of parallel propagating hydromagnetic waves into magnetic pulsations - A simulation study Steepening of parallel propagating hydromagnetic waves into magnetic pulsations - A simulation study

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617599a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,599-17,607. Research sponsored by DOE and NASA.

Physics

31

Earth Magnetosphere, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Bow Waves, Satellite Observation, Shock Waves, Simulation, Wave Amplification

Scientific paper

The steepening mechanism of parallel propagating low-frequency MHD-like waves observed upstream of the earth's quasi-parallel bow shock has been investigated by means of electromagnetic hybrid simulations. It is shown that an ion beam through the resonant electromagnetic ion/ion instability excites large-amplitude waves, which consequently pitch angle scatter, decelerate, and eventually magnetically trap beam ions in regions where the wave amplitudes are largest. As a result, the beam ions become bunched in both space and gyrophase. As these higher-density, nongyrotropic beam segments are formed, the hydromagnetic waves rapidly steepen, resulting in magnetic pulsations, with properties generally in agreement with observations. This steepening process operates on the scale of the linear growth time of the resonant ion/ion instability. Many of the pulsations generated by this mechanism are left-hand polarized in the spacecraft frame.

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