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Topside optical view of the dayside cleft auroraPhotometers on the ISIS-II spacecraft provide a view of the atomic oxygen 5577-A and 6300-A emissions and the N2(+) 3914-A emission detected as dayside aurora in the magnetospheric cleft region. The 6300-A emission forms a continuous and permanent band across the noon sector, at about 78 deg invariant latitude, with a defined region of maximum intensity that is never less than 2 kR (uncorrected for albedo) and is centered near magnetic noon. There are significant differences in the intensity patterns on either side of noon and their responses to geomagnetic activity. Discrete 3914-A auroral forms appear within this region at preferred locations that cannot be precisely specified but which tend to the poleward edge of the 6300-A emission in the evening and the equatorward edge in the morning, where the difference between the two emissions is greatest. It is concluded that the discrete auroras observed by all-sky cameras in the day sector follow the 6300-A emission through the cleft region, though a definite cleft boundary is not defined.
Document ID
19770030580
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shepherd, G. G.
(Calgary Univ. Alberta Canada)
Thirkettle, F. W.
(York University Downsview, Ontario, Canada)
Anger, C. D.
(Calgary, University Calgary, Alberta, Canada)
Date Acquired
August 9, 2013
Publication Date
October 1, 1976
Publication Information
Publication: Planetary and Space Science
Volume: 24
Subject Category
Geophysics
Accession Number
77A13432
Distribution Limits
Public
Copyright
Other

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