Modulational instability of lower hybrid waves at the magnetopause

Details Modulational instability of lower hybrid waves at the magnetopause Modulational instability of lower hybrid waves at the magnetopause

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923735s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,735-23,740

Physics

Plasma Physics

16

Anisotropic Media, Magnetohydrodynamic Stability, Magnetohydrodynamic Turbulence, Magnetopause, Modulation, Particle Diffusion, Plasma Heating, Plasma Waves, Diffusion Coefficient, Earth Magnetosphere, Energetic Particles, Magnetosheath, Plasma Physics

Scientific paper

The role of lower bybrid waesat the magnetopause is reexamined. It is found that for the maximum observed wave power, the lower hybrid waves are unstable to a modulational instability on the magnetosheath side of the magnetopause. The modulational instabitlity leads to localized field structures oriented predominantly along the magnetic field. Such patchy lower hybrid turbulence has been observed by some spacecraft. As a result of the large T(sub i)/T(sub e) ratio, the waves saturate by ion heating; as a result, unlike other settings (e.g. comets, critical ionization phenomena) energetic electrons are not expected. The stochasitc electron transport in the presence of such turbulence is analyzed and results in strongly anistropic electron diffusion, with the dominant direction across the magnetic field. The diffusion rate exceeds significantly that expected from quasi-linear considerations and, for magnetospause parameters, also exceeds the rate discussed by Sonnerup (1980).

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