Detached auroral arcs in the trough region

Details Detached auroral arcs in the trough region Detached auroral arcs in the trough region

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2683a&link_type=abstract

Journal of Geophysical Research, vol. 83, June 1, 1978, p. 2683-2689. National Research Council of Canada

Physics

11

Ionospheric Composition, Red Arcs, Troughs, Electron Energy, Ionospheric Electron Density, Isis Satellites, Northern Hemisphere, Oxygen Spectra

Scientific paper

In a previous paper, Moshupi et al. (1977) have reported on the occurrence of rare auroral 'patches' equatorward of the normally well-defined boundary of diffuse aurora. Some less spectacular but more common arclike features were observed in the same 'trough' region (between the plasmapause and the auroral oval) during the period 1972-1975. These 'detached' arcs show some similarities to stable auroral red arcs in terms of their location and occurrence, but are completely different spectroscopically in that the stable auroral red arcs produce almost pure atomic oxygen red line emissions, whereas the detached arcs are deficient in red line emission - a feature implying totally different production mechanisms. The characteristics of the detached lines are described, including their unusual local time/longitude dependence.

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