Mapping of ionospheric F-region parameters from atomic oxygen airglow emissions

Mathematics – Logic

Scientific paper

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Airglow, F Region, Oxygen Spectra, Space Plasmas, Ionospheric Electron Density, Spread F

Scientific paper

Simultaneous North-South scanning observations of the OI 7774 A and 6300 A nightglow emissions have been carried out at Cachoeira Paulista (geographic coordinates 22.7 deg S, 45.0 deg W; geomagnetic latitude 12.0 deg S), Brazil, to study the tropical F-region dynamics under spread-F and no spread-F conditions. From the observed emission intensities the ionospheric F-region peak electron densities and peak heights can be determined with a good coverage both in latitude and local time. The results are presented in the form of computer generated gray level shade maps showing the variations of the column intensities of the 7774 A emission (J7774) and of the 6300 A emission (J6300), as well as the variations of square root of (J7774) (related to F-region peak electron density) and of the ratio square root of (J7774)/J6300 (related to F-region peak height), as a function of zenith distance (latitude) and local time. Significant features of these observations are discussed. This technique is useful to study dynamical processes and large scale plasma irregularities in the night-time tropical ionosphere.

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