Ion cyclotron waves - Direct comparison between ground-based measurements and observations in the source region

Details Ion cyclotron waves - Direct comparison between ground-based measurements and observations in the source region Ion cyclotron waves - Direct comparison between ground-based measurements and observations in the source region

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..195p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 195-202. Research supported by the Centre National d

Computer Science

Sound

67

Equatorial Atmosphere, Ion Cyclotron Radiation, Plasma Diagnostics, Plasma Waves, Space Plasmas, Footprints, Geos 1 Satellite, Ground Truth, Helium Ions, Satellite Sounding

Scientific paper

Simultaneous measurements of ion cyclotron waves (ICWs) from aboard the GEOS spacecraft and in the vicinity of their magnetic footprints using the French mobile station are compared. While ICWs with frequency F less than the He(+) gyrofrequency at the equator F(He) generally propragate to the ground, only 50 percent of those generated above F(He) can reach the ground station. These results are in good agreement with the conclusions of Rauch and Roux (1982), based on the measurements of Young et al. (1981), that in an He(+)-rich plasma ICWs with F greater than F(He) suffer a reflection where the frequency locally matches the local bi-ion hybrid frequency. The tunnelling of ICWs through the stopband induced by the presence of minor He(+) ions is calculated as a function of He(+) concentration, showing that the transmission coefficient strongly depends on the wave frequency for a given He(+) abundance ratio. The results are supported by observations.

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