Convection of ion cyclotron waves to ion-heating regions

Details Convection of ion cyclotron waves to ion-heating regions Convection of ion cyclotron waves to ion-heating regions

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617573r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Oct. 1, 1991, p. 17,573-17,579. Research supported by NFR and NASA.

Physics

7

Ion Cyclotron Radiation, Ionic Waves, Ionospheric Heating, Convection, Magnetoplasmadynamics, Space Plasmas

Scientific paper

Results are presented on calculations of the convection, to lower altitudes, of low-frequency ion cyclotron waves generated in the central plasma sheet. In the calculations, ion cyclotron waves generated in the equatorial plane by a proton temperature anisotropy are considered, and the computed growth rates are used to create a model wave distribution. Spectral densities are then mapped along the magnetic field lines, using phase space methods of Ronnmark and Larsson (1988). It was found that, even in the absence of growth associated with a plasma instability, the electric fields of ion cyclotron emissions from the equatorial region will increase substantially as the waves propagate to higher latitudes. It is shown that ion cyclotron waves propagating down the field lines may contribute to the waves observed together with ion conics.

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