Auroral density fluctuations on dispersive field line resonances

Details Auroral density fluctuations on dispersive field line resonances Auroral density fluctuations on dispersive field line resonances

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.4399r&link_type=abstract

Journal of Geophysical Research, Volume 104, Issue A3, p. 4399-4410

Physics

31

Ionosphere: Polar Cap Ionosphere, Ionosphere: Plasma Temperature And Density, Magnetospheric Physics: Energetic Particles, Precipitating

Scientific paper

A model is presented that describes the excitation of density perturbations and parallel electric fields by standing shear Alfvén waves on dipole fields in Earth's magnetosphere. The model includes the effects of electron inertia and gyro-kinetic dispersion, accounting for field-aligned variations of the electron and ion temperatures and the ambient plasma density. In a model dipole magnetosphere, it is found that dispersion and nonlinearity determine the depth, spatial structure, and temporal evolution of large-amplitude density fluctuations near to the polar ionospheres. The characteristics of magnetospheric density cavities and their relationship to auroral luminosity, or field-aligned currents, is discussed in the context of recent satellite and ground based observations.

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