Interaction of particles with ion cyclotron waves and magnetosonic waves - Observations from GEOS 1 and GEOS 2

Details Interaction of particles with ion cyclotron waves and magnetosonic waves - Observations from GEOS 1 and GEOS 2 Interaction of particles with ion cyclotron waves and magnetosonic waves - Observations from GEOS 1 and GEOS 2

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1393k&link_type=abstract

(International Association of Geomagnetism and Aeronomy, Symposium on Theory and Modelling of Hydromagnetic Waves, Hamburg, West

Computer Science

17

Ion Cyclotron Radiation, Magnetosonic Resonance, Plasma-Particle Interactions, Satellite Observation, Space Plasmas, Wave Interaction, Extremely Low Radio Frequencies, Geos Satellites (Esa), Wave Dispersion, Wave Propagation

Scientific paper

The results of coordinated measurements of ion composition, thermal plasma, and energetic particles in the magnetosphere are used to demonstrate that the ULF waves recently observed by the GEOS spacecraft could have been destabilized by protons with energies above a few keV. In the case of ion cyclotron waves (ICWs) it is found that enhanced cold He(+) concentrations above a threshold level of a few percent are required, as well as anisotropic distributions of energetic photons. In the case of magnetosonic waves (MSWs) two possible generation mechanisms were identified: (1) a ring-like distribution which is partially derived from the velocity wave perpendicular to the geomagnetic field; and (2) sharp particle gradients which have a scale length of at most a few ion gyroradii. It is suggested that amplified MSW heat low energy protons while ICWs heat cold He(+) ions.

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