Convective growth rate of ion cyclotron waves in a H/sup +/-He/sup +/ and H/sup +/-He/sup +/-O/sup +/ plasma

Journal Article · Tue Mar 01 04:00:00 EST 1983 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA088iA03p02170· OSTI ID:6267763

Gomberoff, L; Neira, R

The behavior of the convective growth rate of the electromagnetic proton-cyclotron instability is investigated in detail in H/sup +/, He/sup +/ plasma and when a third (minority) cold ion component such as O/sup +/ is taken into account. It is shown that amplification is the result of an interplay between the cold species and the thermal anisotropy of the energetic protons. The results seem to be in good agreement with the observations performed on board GEOS 1 and 2 concerning the generation of ULF waves, below the proton gyrofrequency. It is also shown that a small amount of O/sup +/ can strongly affect the behavior of the convective growth rate of the instability below the He/sup +/ gyrofrequency, even far away from the O/sup +/ stop band.

• Research Organization: Departmento de Fisica, Facultad de Ciencias Basicas, Universidad de Chile, Santiago, Chile
• OSTI ID: 6267763
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 88:A3; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CATIONS
CHARGED PARTICLES
COLD PLASMA
CYCLOTRON INSTABILITY
DISPERSION RELATIONS
HELIUM IONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INSTABILITY
INSTABILITY GROWTH RATES
ION DENSITY
ION PLASMA WAVES
ION WAVES
IONS
OXYGEN IONS
PLASMA
PLASMA INSTABILITY
PLASMA MICROINSTABILITIES
PLASMA WAVES
PROTON DENSITY