Helium cyclotron resonance within the earth's magnetosphere

Details Helium cyclotron resonance within the earth's magnetosphere Helium cyclotron resonance within the earth's magnetosphere

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..103m&link_type=abstract

Geophysical Research Letters, vol. 8, Jan. 1981, p. 103-106.

Physics

79

Cyclotron Frequency, Cyclotron Resonance, Earth Magnetosphere, Geocyclotrons, Helium Ions, Ats 6, Energy Transfer, Histograms, Ion Distribution, Magnetohydrodynamic Waves

Scientific paper

A histogram of electromagnetic Alfven/ion cyclotron wave frequencies, sampled within the geostationary environment and normalized by the equatorial proton cyclotron frequency, shows a dramatic gap centered near the helium (He +) cyclotron frequency. Also, strongly cyclotron phase bunched helium ions (20-200 eV) have been observed directly within the vicinity of wave environments. These observations are interpreted as resulting from the absorption of the waves through cyclotron resonance by cool ambient populations of helium ions.

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