Observations of ion cyclotron waves near synchronous orbit and on the ground

Details Observations of ion cyclotron waves near synchronous orbit and on the ground Observations of ion cyclotron waves near synchronous orbit and on the ground

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...42..357f&link_type=abstract

(URSI, USAF, NASA, et al., International School for Space Simulations, 2nd, Kapaa, HI, Feb. 4-15, 1985) Space Science Reviews (I

Physics

53

Ion Cyclotron Radiation, Magnetospheric Instability, Plasma Waves, Space Plasmas, Diurnal Variations, Helium Ions, Oxygen Ions, Synchronous Satellites, Telluric Currents, Wave Propagation

Scientific paper

Ion cyclotron waves (ICWs) generated in the magnetosphere by the ion cyclotron instability of 10-100 keV protons are now known to be the origin of short-period (0.1-5 Hz) electromagnetic field oscillations observed by synchronous spacecraft and on the earth's surface. Observations of the various wave characteristics, including spectral and polarization properties, that lead to the identification of generation and propagation mechaniisms, and regions in the magnetosphere are described with reference to ATS-6, GEOS, and ground-based wave data and interpreted using cold plasma propagation theory. The presence of heavy ions (O/+/, He/+/) dramatically modifies ICW magnetospheric propagation characteristics giving rise to spectral slots and polarization reversals. These properties may be used in plasma diagnostics. Finally satellite-ground correlations and techniques for determining the magnetospheric source position of ICWs not seen at synchronous orbit but observed on the ground as structured Pc1 pulsations are considered.

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