Physics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cajph..60..349m&link_type=abstract
Canadian Journal of Physics, vol. 60, Mar. 1982, p. 349-356. National Research Council of Canada
Physics
78
Auroras, Interplanetary Magnetic Fields, Polar Caps, Images
Scientific paper
Optical images of the polar cap region at both 5577 and 3914 A obtained from 1400 km above the earth are used in studying the relationship between polar cap and oval aurora during periods when the interplanetary magnetic field is strongly northward, that is, B sub z is greater than 3.5 nT. When this rather rare condition obtains, the distinction between the two types of aurora is no longer as clear as depicted on the basis of statistical definitions of the auroral oval. It is found that diffuse, weak emission can fill in the region between the auroral oval and discrete auroral features in the polar cap. The polar cap discrete features can seem very similar to auroral oval arcs in intensity, intensity ratio, and structure. It is found that, under conditions of large positive B sub z, the region of closed magnetic field lines can expand poleward to occupy much of the high latitude region.
Anger Clifford D.
Cogger Leroy L.
Murphree John S.
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