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

Autor:	J. D. Kelly, R. A. Doe, David P. Steele, Joshua Semeter
Rok vydání:	1997
Předmět:	Brightness Tomographic reconstruction Materials science business.industry Plasma diffusion Latitude Arc (geometry) Geophysics Optics Physics::Space Physics General Earth and Planetary Sciences Emission spectrum Tomography Monochromatic color business
Zdroj:	Geophysical Research Letters. 24:1119-1122
ISSN:	0094-8276
DOI:	10.1029/97gl00828
Popis:	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: η630 (lat,z). The time evolution of η630 (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.
Databáze:	OpenAIRE
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