Physics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.4132s&link_type=abstract
Journal of Geophysical Research, vol. 85, Aug. 1, 1980, p. 4132-4138. Research supported by the Norges Almenvitenskapelige Fors
Physics
1
Auroras, Daytime, Earth Magnetosphere, Magnetic Disturbances, Optical Scanners, Airglow, Cusps, Diurnal Variations, Geomagnetic Latitude, Night, Nitrogen, Northern Hemisphere, Oxygen, Photometers
Scientific paper
Meridian-scanning photometer (MSP) measurements of atmospheric optical emissions made in Longyearbyen, Svalbard, in the winter of 1978-1979 show two major types of daytime auroras associated with the magnetospheric cusp region. A steady, subvisual arc extending over 1.5 to 5 deg of invariant latitude characterized by a predominance of 6300-A emission is a permanent feature of the cusp region. Additionally, short-lived, relatively narrow arcs and bands appear occasionally within this region; in these transient auroral forms forbidden O I 5577-A line and the N2(+) 1 NG bands are the strong optical emissions. Detailed correlation of the cusp optical emission and simultaneous geomagnetic measurements from both day and nightside stations show that the cusp, as defined by the 6300-A arcs, moves equatorward during magnetically disturbed conditions.
Deehr Charles S.
Egeland A. A.
Henriksen Kim
Romick Gerald J.
Sandholt Per Even
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