Other
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..145b&link_type=abstract
Geophysical Research Letters, vol. 3, Mar. 1976, p. 145-147. Research supported by the Norges Almenvitenskapelige Forskningsrad
Other
7
Auroral Arcs, Interplanetary Magnetic Fields, Satellite Observation, Statistical Correlation, Isis-B, Magnetic Field Configurations, Polar Caps, Satellite-Borne Instruments, Spatial Distribution
Scientific paper
Sun-aligned arcs are long and sometimes narrow optical structures which are oriented in the sun-earth direction and which occur in the polar cap, generally during intervals of low magnetic activity. Their appearance, as seen by the DMSP and ISIS-2 satellite photometers, is examined with respect to the north-south orientation of the interplanetary magnetic field. In the DMSP pictures, it is found that they appear when the interplanetary magnetic field (IMF) is directed northward. In 16 out of 18 unambiguous observations of sun-aligned arcs by ISIS-2, the IMF was directed northward; for the other two, no IMF data was available. These results provide evidence for a strong correlation between the northward direction of the IMF and the occurrence of sun-aligned arcs in the northern polar cap.
Berkey Tom F.
Cogger Leroy L.
Ismail Syed
Kamide Yohsuke
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