OH emission intensity measurements during the 1969 NASA Airborne Auroral Expedition

Details OH emission intensity measurements during the 1969 NASA Airborne Auroral Expedition OH emission intensity measurements during the 1969 NASA Airborne Auroral Expedition

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5467m&link_type=abstract

(International Association of Geomagnetism and Aeronomy, Meeting, Grenoble, France, Sept. 3, 1975.) Journal of Geophysical Resea

Other

Auroral Irradiation, Hydroxyl Emission, Luminous Intensity, Nightglow, Radiation Measurement, Twilight Glow, Airborne Equipment, Atmospheric Models, Mesosphere, Nasa Programs, Ozone, Photodissociation

Scientific paper

Absolute intensity measurements of the (8, 6) OH band obtained during 10 flights of the December 1969 NASA Auroral Airborne Expedition are presented. Nightglow intensities higher by a factor of 2 than the usual values are recorded during flights 8, 14, and 15. The OH variations are compared with the evolution of the green line and O2(1 Delta g) emissions measured by other experimenters on board the aircraft. Before sunrise the twilight variations of OH down to a solar depression angle of 5 deg show a rapid decrease. A theoretical prediction of the OH, O I 5577 A, and O2(1 Delta g) emissions is evaluated by means of an extensive time-dependent oxygen-hydrogen model of the 25- to 150-km region. Twilight decrease of the OH emission is interpreted in terms of mesospheric ozone photodissociation. Nighttime variations of the emissions may be reproduced if modifications of the dynamic regime are introduced into the model.

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