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Voyager 2 ultraviolet spectrometer solar occultations at Neptune - Constraints on the abundance of methane in the stratosphereThe study compares Voyager 2 ultraviolet spectrometer (UVS) solar occultation lightcurves at wavelengths 125-138 nm acquired during the Neptune encounter with 1D methane photochemical transport models. For the p-T models under consideration, acceptable fits to the UVS lightcurves are obtained with eddy mixing coefficient values (K sub 1/2) near the half-light altitudes of 2-15 x 10 exp 6 sq cm/s (ingress) and 4-35 x 10 exp 6 sq cm/s (egress) and lower stratospheric methane mixing ratio values of 5-100 x 10 exp -5. For the nominal p-T models and a criterion based on replicating the spacing in altitude of the 125-138 nm UVS lightcurves, K sub 1/2 values of 10 exp 7 sq cm/s (ingress) and 1-2 x 10 exp 7 sq cm/s (egress) and methane mixing ratios of about 0.0004 (ingress and egress) are indicated.
Document ID
19920068975
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bishop, James
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Atreya, Sushil K.
(Michigan, University Ann Arbor, United States)
Romani, Paul N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sandel, Bill R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Herbert, Floyd
(Arizona, University Tucson, United States)
Date Acquired
August 15, 2013
Publication Date
July 25, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: E7 J
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Report/Patent Number
ISSN: 0148-0227
Accession Number
92A51599
Funding Number(s)
CONTRACT_GRANT: NAS1-100
CONTRACT_GRANT: NAGW-610
CONTRACT_GRANT: NAGW-1498
CONTRACT_GRANT: NAGW-1504
CONTRACT_GRANT: NAGW-1771
Distribution Limits
Public
Copyright
Other

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