A comparison of thermospheric [O] derived at EISCAT with [O] predicted by MSIS

In recent years aeronomic considerations of the value of the O+−O collision cross‐section (QO+−O) in the ionospheric F‐region have resulted in many values of a multiplicative adjustment factor (F) to the standard value of QO+−O which had been in use from the mid sixties to the late eighties. QO+−O a...

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Bibliographic Details
Published in:Geophysical research letters 1998-06, Vol.25 (12), p.2119-2122
Main Authors: Schoendorf, J., Oliver, W. L.
Format: Article
Language:English
Subjects:
Atmospheric composition. Chemical and photochemical reactions
Earth, ocean, space
Exact sciences and technology
External geophysics
Physics of the high neutral atmosphere
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Summary:In recent years aeronomic considerations of the value of the O+−O collision cross‐section (QO+−O) in the ionospheric F‐region have resulted in many values of a multiplicative adjustment factor (F) to the standard value of QO+−O which had been in use from the mid sixties to the late eighties. QO+−O and oxygen concentration ([O]) appear as a product in aeronomic calculations, so F can also be considered a multiplicative factor for the oxygen. [O] derived at EISCAT for data from 1984 to 1997 is compared to oxygen predicted by MSIS and values of F are calculated as a function of solar cycle and year. There is a solar cycle variation, with F varying from .65 at solar minimum to 1.18 at solar maximum. For solar fluxes between 100 and 160 solar flux units F at EISCAT is in good agreement with a value of F calculated for MSIS. No long term trend in the relationship between EISCAT [O] and MSIS [O] was found.
ISSN:0094-8276
1944-8007
DOI:10.1029/98GL51502