Ground-based imaging of detached arcs, ripples in the diffuse aurora, and patches of 6300-A emission

Details Ground-based imaging of detached arcs, ripples in the diffuse aurora, and patches of 6300-A emission Ground-based imaging of detached arcs, ripples in the diffuse aurora, and patches of 6300-A emission

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5367m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5367-5381.

Mathematics

Logic

22

Auroral Arcs, F Region, Image Analysis, Oxygen Spectra, Ripples, Airglow, Geomagnetism, Meteorological Satellites, Visible Spectrum

Scientific paper

Optical and plasma characterizations of three distinct phenomena are reported from a period of coordinated multidiagnostic observations of the subauroral ionosphere conducted in April 1985. The phenomena are arcs detached from the diffuse aurora, undulations in the equatorward edge of the diffuse aurora, and isolated patches of emission in the F region trough. The detached arc observations show that strong F region enhancements occur in both 6300-A emission and total plasma content, suggesting an electron precipitation source essentially similar to the plasma sheet population that causes the diffuse aurora and the poleward wall of the F region trough. The rippled features along the equatorward edge of the diffuse aurora are associated with strong electric fields and large radial ion temperature gradients. The isolated and long-lived patches of 6300-A emission have no corresponding F region plasma enhancements, but are associated with enhanced radar returns from the E region.

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