OI 6300 and 7774 A airglow measurements of equatorial plasma depletions

Astronomy and Astrophysics – Astronomy

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Airglow, Equatorial Atmosphere, F Region, Ionospheric Electron Density, Space Plasmas, All Sky Photography, Plasma Density

Scientific paper

A report is presented on simultaneous measurements of the equatorial airglow in the Appleton anomaly region in OI 6300 and 7774 A radiation, obtained by an airborne ionospheric observatory on December 1979 flights along both the Ascension Island magnetic meridian and +15 deg magnetic latitude between Africa and South America. Peak electron densities in the F-region, both within and outside field-aligned plasma depletions, are estimated from measurements of the OI 7774 A airglow. In one nighttime measurement, peak electron densities varied from about 3,300,000/cu cm outside the depletion to 1,100,000/cu cm inside the depletion. A decrease in the I 7774 to the 1/2/I 6300 ratio from outside to inside a depletion suggests that the fractional electron density decrease is larger near the peak of the F-layer than at lower altitudes in the bottomside ionosphere.

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