The OI844. 6 nm emission in evening twilight

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Geophysical Research Letters (American Geophysical Union); (USA)

DOI:https://doi.org/10.1029/GL016i012p01449· OSTI ID:5838367

Bahsoun-Hamade, F; Wiens, R H; Shepherd, G G ^[1]

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1. Institute for Space and Terrestrial Science, North York, Ontario (Canada)

Ground-based measurements of the atomic oxygen multiplet emission at 844.6nm were made during evening twilight through the fall and winter of 1988/89, from Toronto using a low-resolution Fabry-Perot interferometer. Observations were made in the azimuth of the sun at 20{degree} above the horizon, over a local solar zenith angle range from 94{degree} to 99{degree}. The radiance variation as a function of SZA is presented, with correction for atmospheric extinction. These are the first ground based measurements of the 844.6 nm emission ever reported for early twilight. The measurements are an important first step in obtaining the atomic oxygen density as well as the ratio of the integrated photoelectron flux to the solar EUV flux. The results are compared with previous measurements by others.

• OSTI ID: 5838367
• Journal Information: Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 16:12; ISSN 0094-8276; ISSN GPRLA
• Country of Publication: United States
• Language: English

Related Subjects

640200* -- Atmospheric Physics
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AIRGLOW
ATOMS
CHEMICAL COMPOSITION
COLLISIONS
COMPARATIVE EVALUATIONS
DENSITY
EARTH ATMOSPHERE
ELECTRON COLLISIONS
ELEMENTS
EMISSION SPECTRA
INTERFEROMETERS
MEASURING INSTRUMENTS
NONMETALS
OXYGEN
PHYSICAL PROPERTIES
SPECTRA
THERMOSPHERE
VARIATIONS