Characteristics of polar cap sun-aligned arcs

Details Characteristics of polar cap sun-aligned arcs Characteristics of polar cap sun-aligned arcs

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.4741i&link_type=abstract

Journal of Geophysical Research, vol. 82, Oct. 1, 1977, p. 4741-4749. National Research Council of Canada

Physics

10

Auroral Arcs, Geomagnetism, Polar Caps, Satellite Observation, Solar Position, Alignment, Data Acquisition, Geomorphology, Interplanetary Magnetic Fields, Isis-B, Optical Scanners, Photometers

Scientific paper

Observations of polar cap sun-aligned arcs obtained with the auroral scanning photometer on Isis 2 for the period 1971 to 1975 are examined. A 2:1 asymmetry was found in the occurrence frequency between the morning and evening sectors of the polar cap. Sun-aligned arcs were observed on only 0.6% of polar cap passes and occurred most frequently during periods of low magnetic activity (Kp and AE). Moreover, for all cases observed during times for which interplanetary magnetic field data were available, the field was directed northward. Although the intensity along any single arc varied considerably, it was found that the 5577 A/3914 A intensity ratio remained constant. Examination of particle data and the observed intensity ratios indicate that the arcs are excited by low-energy (not greater than 1 keV) electron fluxes.

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