Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.9107m&link_type=abstract
Journal of Geophysical Research, vol. 87, Nov. 1, 1982, p. 9107-9119.
Physics
60
Cyclotron Frequency, Helium Ions, Ion Cyclotron Radiation, Magnetohydrodynamic Waves, Plasma Resonance, Propagation Modes, Protons, Wave Amplification, Wave Propagation
Scientific paper
A full wave amplification model is developed for propagation of various low frequency plasma modes through the magnetic gradients of a quasi-dipolar magnetic field model. The model was formulated to examine the amplification characteristics of the proton cyclotron instability in a helium rich plasma in relation to the observed structure and growth patterns of geostationary Alfven/ion cyclotron waves. Linear amplification values were calculated, with conclusions based on a single pass through the unstable region. It was concluded that the helium cyclotron absorption is associated with the dispersion effects as the source of the equatorial frequency gap structure. Magnetic gradients are noted to always be present in space plasmas, with the Alfven/ion cyclotron waves being generated near the minimum field lines regions. Helium enhancement is suggested to not suppress high frequency branches of the waves.
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