Auroral forms and the field-aligned current structure associated with field line resonances

Details Auroral forms and the field-aligned current structure associated with field line resonances Auroral forms and the field-aligned current structure associated with field line resonances

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10625825m&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A11, p. 25825-25834

Physics

6

Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Current Systems, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

We show evidence to suggest that some auroral forms may be related to the field-aligned current structure associated with magnetohydrodynamic wave activity, specifically field line resonances. These auroras appear as a series of azimuthally spaced east-west elongated arcs, inclined slightly from north to south. Modeling shows that this ``braided'' appearance reflects the locations of upward field-aligned current driven by the wave. Moreover, more complicated auroral structures can be produced if several harmonically related waves occur together. We model a situation in which two harmonic components are present at the latitude of resonance and demonstrate the striking similarity between the resulting field-aligned current structures and actual auroral observations.

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