Formation of a conical distribution and intense ion heating in the presence of hydrogen cyclotron waves

Details Formation of a conical distribution and intense ion heating in the presence of hydrogen cyclotron waves Formation of a conical distribution and intense ion heating in the presence of hydrogen cyclotron waves

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..811o&link_type=abstract

Geophysical Research Letters, vol. 8, July 1981, p. 811-814.

Physics

69

Cyclotron Radiation, Electrostatic Waves, Hydrogen Ions, Ion Distribution, Ionospheric Currents, Magnetohydrodynamic Stability, Plasma Heating, Auroral Zones, Energy Transfer, Field Aligned Currents, Ion Temperature, Ionospheric Ion Density, Plasma Drift, Plasma Spectra, Plasma-Electromagnetic Interaction, Velocity Distribution, Wave Propagation

Scientific paper

In the considered investigation, it is assumed that the field aligned currents are responsible for producing electrostatic harmonic cyclotron waves (EHC). Using a one-dimensional simulation model in which the electron velocity distribution is maintained by a constant injection of the initial distribution, it is shown that, in contrast to earlier initial value simulations, EHC waves grow to a large amplitude, resulting in the formation of an anisotropic ion velocity distribution. Both the heating rate and the anisotropy are in reasonable agreement with the quasi-linear theory, taking into account the cyclotron resonance. The results show that the saturation is due to the combined effects of wave induced diffusion in an electron velocity space and the heating of ions perpendicularly. Both these effects reduce the growth rate.

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