Combined effect of cold H/sup +/ and He/sup +/ ions on the proton cyclotron electromagnetic instability

Journal Article · Fri Jan 01 04:00:00 EST 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA087iA01p00095· OSTI ID:5199922

Gomberoff, L; Cuperman, S

Observations aboard GEOS 1 and 2 show a correlation between generation of strong ion-cyclotron ULF waves below the proton gyrofrequency and an increase in the cold He/sup +/ ion concentration. The amplification process due to one cold species seems to be well understood and has been thoroughly discussed. Nevertheless, the amplification process when two cold species are present has not been so far properly studied. The GEOS experiments have also shown a close association between the occurrence of ion-cyclotron ULF waves and the presence of thermal He/sup +/ ions in the equatorial region of the magnetosphere (Young et al., 1979). Thus we study here the combined effect of cold H/sup +/ and He/sup +/ ions on the proton cyclotron electromagnetic instability.

• Research Organization: Departamento de Fisica, Facultad de Ciencias, Universidad de Chile, Casilla, 653, Santiago, Chile
• OSTI ID: 5199922
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 87:A1; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
CHARGED PARTICLES
CYCLOTRON INSTABILITY
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
GYROFREQUENCY
HADRONS
HELIUM IONS
HYDROGEN IONS
INSTABILITY
ION DENSITY
IONS
MAGNETOSPHERE
NUCLEONS
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
PROTONS
RADIATIONS
ULTRALOW FREQUENCY RADIATION