Physics
Scientific paper
Aug 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981cajph..59.1137a&link_type=abstract
Canadian Journal of Physics, vol. 59, Aug. 1981, p. 1137-1142. Natural Sciences and Engineering Research Council of Canada
Physics
1
Auroras, Geomagnetic Pulsations, Isis Satellites, Nocturnal Variations, Plasma Layers, Satellite Observation, Coordinates, Magnetohydrodynamic Stability, Photometry
Scientific paper
ISIS 2 satellite observations of the equatorward boundary of the diffuse aurora in the early morning magnetic local time (MLT) sector are found to reveal irregularities in that boundary which are identified as a pulsating aurora. In the case of 'cartwheel' data, repeated scans made through the same meridian show clear temporal variations in regions having scale sizes on the order of 300-400 km in north-south extent and intensities of up to 60% of the diffuse auroral intensity poleward of the pulsations. No corresponding fluctuations in intensity at the poleward boundary are found when the pulsations are observed. When two-dimensional scans of the morning section are carried out, similar irregularities are seen which range from quasi-periodic patch-like regions at the equatorward boundary to north-south elongated irregularities in the diffuse aurora as a whole.
Anger Clifford D.
Cogger Leroy L.
Murphree John S.
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