Nonlinear magnetosonic waves and mirror mode structures in the March 1991 ULYSSES interplanetary event

Details Nonlinear magnetosonic waves and mirror mode structures in the March 1991 ULYSSES interplanetary event Nonlinear magnetosonic waves and mirror mode structures in the March 1991 ULYSSES interplanetary event

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1267t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 12, June 19, 1992, p. 1267-1270.

Physics

54

Magnetic Mirrors, Magnetosonic Resonance, Plasma Waves, Solar Wind, Ulysses Mission, Energetic Particles, Power Spectra, Solar Corona, Solar Flares

Scientific paper

In examining the March 23-25, 1991 Ulysses (2.2 AU) high speed solar wind events, two distinct plasma wave modes are found: steepened magnetosonic waves with whistler precursors and mirror mode structures. These two modes are locally generated by plasma instabilities, presumably associated with anisotropies existing in the energetic shock particles and solar wind plasma, respectively. The magnetosonic waves are generated by a right-hand resonant instability associated with an about 40 keV ion beam. By an extrapolation of the results presented here, assuming microflares and nanoflares at the sun generate shocks in the lower corona and these shocks accelerate energetic ions, it is suggested that the ions, via the right-hand resonant instability, generate magnetosonic waves which steepened to form 'microshocks'. These shocks could, in turn, accelerate more energetic ions, leading to a shock/energetic ion/magnetosonic wave cascade. These newly formed magnetosonic waves and shocks presumably could propagate in a broad range of directions, leading to energy dissipation over a large region of the outer corona.

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