Magnetosonic waves and their relationship with energetic protons

Details Magnetosonic waves and their relationship with energetic protons Magnetosonic waves and their relationship with energetic protons

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..593p&link_type=abstract

In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 593-598 (SEE N85-24544 14-46)

Computer Science

Magnetic Equator, Magnetoacoustic Waves, Magnetospheric Proton Density, Solar Protons, Geos 1 Satellite, Geos 2 Satellite, Magnetohydrodynamic Stability, Ring Currents

Scientific paper

Monochromatic waves with frequencies close to or above proton gyroharmonics were observed in the vicinity of the geomagnetic equator by the GEOS spacecraft. The waves consist of harmonically-related emissions and propagate in a direction perpendicular to the DC magnetic field. The frequency spectrum indicates strong nonlinear coupling between the components of the spectrum. Two different energy sources are identified for destabilizing these waves : a ring-like distribution of 10 keV protons, and a sharp drift boundary of these protons. Both kinds of proton distribution can excite a nonresonant instability (flute mode) near the proton gyrofrequency and its harmonics. Experimental results are compared to growth rate calculations.

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