Dispersive field line resonances on auroral field lines

Details Dispersive field line resonances on auroral field lines Dispersive field line resonances on auroral field lines

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10019457s&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A10, p. 19457-19472

Physics

54

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Electric Fields, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

The formation of dispersive Alfvén resonance layers is investigated using a three-dimensional, two-fluid, magnetically incompressible model, including electron inertia and finite pressure. The equations are solved in ``box'' geometry with uniform magnetic field bounded by perfectly conducting ionospheres. Field line resonance (FLR) is stimulated within a density boundary layer with gradient transverse to ambient B; a parallel gradient in the Alfvén speed is also included. Numerical results show that the resonance amplitude is largest on the magnetic shell with eigenfrequency matching the frequency of the surface wave propagating on the density boundary layer. Efficient coupling between the resonant Alfvén wave and surface wave produces a relatively narrow FLR spectrum, even when the driver is broadbanded. Effective coupling to the external driver occurs only for long-wavelength azimuthal modes. It is shown that the parallel inhomogeneity limits radiation of dispersive Alfvén waves by the FLR. The results provide new insights into low-altitude satellite observations of auroral electromagnetic fields and the formation of discrete auroral arcs. .

Affiliated with

Also associated with

No associations

Rating

Dispersive field line resonances on auroral field lines does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dispersive field line resonances on auroral field lines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dispersive field line resonances on auroral field lines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1354540