Tomographic reconstruction of 630.0 nm emission structure for a polar cap arc

Details Tomographic reconstruction of 630.0 nm emission structure for a polar cap arc Tomographic reconstruction of 630.0 nm emission structure for a polar cap arc

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1119d&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 9, p. 1119-1122

Physics

7

Ionosphere: Polar Cap Ionosphere, Magnetospheric Physics: Polar Cap Phenomena

Scientific paper

Monochromatic imagers located at two sites in the Canadian Arctic were operated concurrently during the poleward transit of a duskside sun-aligned polar cap arc on 19 February 1996. The arc was observed by both stations in 630.0 nm images over a 5-min period. Profiles of 630.0 nm brightness versus elevation angle were extracted from pairs of images along a great circle defined by the two ground stations. These data were then supplied as inputs to a tomographic reconstruction for the arc-related 630.0 nm volume emission rate in a vertical (latitude vs. altitude) plane: ɛ630(lat,z). The time evolution of ɛ630(lat,z) structure for this polar cap arc indicates that a modification to the electron source energy distribution and not a thermospheric process (such as neutral heating and plasma diffusion/decay) controlled the arc-related 630.0 nm emission.

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