Waves in the Earth's magnetosheath: Observations and interpretations

Details Waves in the Earth's magnetosheath: Observations and interpretations Waves in the Earth's magnetosheath: Observations and interpretations

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..329l&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 8-9, p. 329-340

Other

21

Cyclotron Radiation, Electromagnetic Radiation, Magnetosheath, Plasma Waves, Recognition, Particle Density (Concentration), Propagation Modes, Variations, Wave Dispersion, Wave-Particle Interactions

Scientific paper

We review the nature and the location of waves observed in the magnetosheath at and below the proton gyrofrequency. The directions of propagation imply that some waves originate in the bow shock and in the magnetopause. Waves are also growing in the whole magnetosheath, wherever the ion distribution functions are unstable. This occurs downstream of the quasi-perpendicular bow shock and in the inner sheath, where the proton temperature T(sub p normal) perpendicular to the ambient magnetic field is larger than the parallel temperature T(sub p parallel). An anticorrelation between T(sub p normal)/T(sub p parallel) and beta(sub p parallel) is observed in the inner sheath; this can result from a quasilinear interaction between unstable waves and particles. The alpha particles present in the sheath modify the dispersion relation of the waves. We discuss the best parameters for identification of the wave modes. The phase difference between the parallel magnetic field and the density fluctuations is not a good identifier: it can be about 180 deg for a mirror mode, for an oblique slow smode, and also for an oblique Alfven ion cyclotron mode. For a given mode, this phase difference depends on the local shape of the particle distribution functions and, if the mode is known from other identifiers, it can help to detect the presence of a hot proton halo of a cold electron core in the distribution functions.

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