Lower hybrid waves in the solar wind

Physics

Scientific paper

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Electrostatics, Plasma Waves, Solar Wind, Electron Energy, Ion Acoustic Waves, Particle Acceleration, Propagation Modes, Wave Dispersion

Scientific paper

It is demonstrated that the frequently observed broad band low frequency electrostatic noise in the solar wind generally has a dominant lower hybrid component. These modes are probably produced by the anisotropic halos of the solar wind electron velocity distributions exhibiting 'heat flux' profiles and thus, are accompanied by broad band, 'hybrid-like' whistler waves. When the electron temperature is much larger than the ion temperature, these modes can also co-exist with the ion acoustic waves. Since lower hybrid modes propagate nearly normal to the interplanetary magnetic field lines, the ions can be transversely accelerated by these waves and attain the observed anisotropic and/or loss-cone-like distributions.

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