Helium cyclotron resonance within the earth's magnetosphere

Journal Article · Thu Jan 01 04:00:00 EST 1981 · Geophys. Res. Lett.; (United States)

DOI:https://doi.org/10.1029/GL008i001p00103· OSTI ID:6617012

Mauk, B H; McIlwain, C E; McPherron, R L

A histogram of electromagnetic Alfven/ion cyclotron wave frequencies, sampled within the geostationary enviroment and normalized by the equatorial proton cyclotron frequency, shows a dramatic gap centered near the helium (He/sup +/) 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.

• Research Organization: Geophysics AK-50, University of Washington, Seattle, Washington 98195
• OSTI ID: 6617012
• Journal Information: Geophys. Res. Lett.; (United States), Journal Name: Geophys. Res. Lett.; (United States) Vol. 8:1; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALFVEN WAVES
BARYONS
CHARGED PARTICLES
CYCLOTRON RESONANCE
EARTH ATMOSPHERE
ELEMENTARY PARTICLES
FERMIONS
HADRONS
HELIUM IONS
HYDROMAGNETIC WAVES
ION WAVES
IONS
MAGNETOSPHERE
NUCLEONS
PLASMA WAVES
PROTONS
RADIATION BELTS
RESONANCE