North-south aligned equatorial airglow depletions

Details North-south aligned equatorial airglow depletions North-south aligned equatorial airglow depletions

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..712w&link_type=abstract

Journal of Geophysical Research, vol. 83, Feb. 1, 1978, p. 712-716. USAF-supported research.

Computer Science

Sound

30

Airglow, All Sky Photography, Auroras, Ionospheric Sounding, Spectrophotometry, Tropical Regions, Depletion, F Region, Fine Structure, Spectral Bands, Vertical Distribution

Scientific paper

A new instrument for all-sky spectrophotometric imaging of aurora and airglow has been installed in the Air Force Geophysics Laboratory's Airborne Ionospheric Observatory. Initial observations of equatorial and near-equatorial 6300-A O I airglow show the existence of north-south aligned regions of airglow depletion. These dark bands often extend more than 1200 km in the north-south direction and 50-200 km in the east-west direction. They are observed to drift toward the east during the evening-midnight hours, with one observation of westward drift after local midnight. Airglow fine structure associated with the boundaries of the dark bands has been observed down to the 2.5-km resolution limit of the instrument. Simultaneous airborne ionospheric soundings indicate that these regions of airglow depletion are characterized by an increase in the virtual height of the F layer. A simple model of field-aligned electron density depletion in the bottomside of the F layer explains both the airglow observations and the ionospheric soundings.

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