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Molecular oxygen measurements at 200 km from AE-D near winter solstice, 1975Utilizing the fly-through mode, the open source neutral mass spectrometer on Atmosphere Explorer-D (AE-D) has measured O2 densities, as well as N2 densities and in situ neutral temperatures, at midmorning during winter solstice over the latitude range 90 degrees S to 90 degrees N. The expected seasonal variation in N2 was found at 200 km together with a more complex behavior in molecular oxygen than might be expected from a diffusive equilibrium model with constant lower boundary values. Under geomagnetically quiet conditions the equatorial 200 km value of O2 was about 1.7 x 10 to the 8th/cu cm. A local maximum in the 200 km O2 densities was found near 70 degrees N, where an average quiet time value was 2.5 x 10 to the 8th/cu cm, implying a 120 km density of 8.3 x 10 to the 10th/cu cm. The in situ temperature measurements confirm the presence of higher temperatures near 70 degrees N latitude, even during geomagnetically quiet conditions.
Document ID
19760058995
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kayser, D. C.
(Minnesota Univ. Minneapolis, MN, United States)
Potter, W. E.
(Minnesota, University Minneapolis, Minn., United States)
Date Acquired
August 8, 2013
Publication Date
August 1, 1976
Publication Information
Publication: Geophysical Research Letters
Volume: 3
Subject Category
Geophysics
Accession Number
76A41961
Funding Number(s)
CONTRACT_GRANT: NAS5-11438
Distribution Limits
Public
Copyright
Other

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