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Predawn enhancement of 6300-A emission observed near the plasmapause from the Isis-2 spacecraft.Data from several Isis-2 spacecraft passes are described in which the 6300-A atomic oxygen red line photometer mapped intensity steps resembling the predawn enhancement. Comparison with the electron density measured at the spacecraft indicates a plasmapause influence on the 6300-A emission rate, in that the intensity varies roughly inversely with the electron density at 1400 km. A simple calculation demonstrates the idea that field line opacity differences for photoelectrons are significant across the plasmapause. The measured electron temperatures are inadequate to account for the 6300-A excitation, thus confirming that it must arise from another mechanism.
Document ID
19730054143
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shepherd, G. G.
(York University Toronto, Canada)
Brace, L. H.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Whitteker, J. H.
(Department of Communications, Communications Research Centre Ottawa, Canada)
Date Acquired
August 7, 2013
Publication Date
August 1, 1973
Publication Information
Publication: Journal of Geophysical Research
Volume: 78
Subject Category
Geophysics
Accession Number
73A38945
Distribution Limits
Public
Copyright
Other

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