Physics – Plasma Physics
Scientific paper
Nov 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10124433a&link_type=abstract
Journal of Geophysical Research, Volume 101, Issue A11, p. 24433-24442
Physics
Plasma Physics
5
Interplanetary Physics: Mhd Waves And Turbulence, Interplanetary Physics: Solar Wind Plasma, Space Plasma Physics: Kinetic And Mhd Theory, Space Plasma Physics: Waves And Instabilities
Scientific paper
A study of the linear dispersion relation for left-handed transverse electromagnetic waves in a solar-wind-like magnetized ion background is presented. In this analysis the dispersion characteristics of the high-order modes of wave propagation are included. These modes exist below but also above the proton gyrofrequency, and its dispersion relation can be approximated by an acoustic-like one. It is shown that a discontinuity arises in the dispersion relation for a proton alpha particles magnetized plasma, when the fraction of alpha particles is increased by virtue of coupling between the normal ion cyclotron mode and high-order modes. It is also shown that the discontinuity can disappear by changing the anisotropy of the alpha particles or their drift velocity. In that case the normal ion cyclotron mode is restored. Some implications of these modes in heating the plasma are also considered.
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