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Equatorial enhancement of the nighttime OH mesospheric infrared airglow

D J Baker1, B K Thurgood1, W K Harrison1, M G Mlynczak2 and J M Russell3

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Global measurements of the hydroxyl mesospheric airglow over an extended period of time have been made possible by the NASA SABER infrared sensor aboard the TIMED satellite which has been functioning since December of 2001. The orbital mission has continued over a significant portion of a solar cycle. Experimental data from SABER for several years have exhibited equatorial enhancements of the nighttime mesospheric OH (Δv=2) airglow layer consistent with the high average diurnal solar flux. The brightening of the OH airglow typically means more H+O3 is being reacted. At both the spring and autumn seasonal equinoxes when the equatorial solar UV irradiance mean is greatest, the peak volume emission rate (VER) of the nighttime Meinel infrared airglow typically appears to be both significantly brighter plus lower in altitude by several kilometres at low latitudes compared with midlatitude findings.


PACS

92.60.hc Mesospheric composition, energy deposition, constituent transport and chemistry

92.60.Vb Solar radiation

92.60.hw Airglow and aurora

MSC

86A10 Meteorology and atmospheric physics (See also 76Bxx, 76E20, 76N15, 76Q05, 76Rxx, 76U05)

Subjects

Environmental and Earth science

Dates

Issue 5 (May 2007)

Received 17 October 2006, accepted for publication 30 January 2007

Published 8 March 2007



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