Simulation studies of ionospheric airglow signatures of plasma depletions at the equator

Computer Science – Sound

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Airglow, Equatorial Atmosphere, Ionospheric Sounding, Space Plasmas, F Region, Ionospheric Electron Density, Oxygen Spectra, Vertical Distribution, Visible Spectrum

Scientific paper

Computer simulation studies have described the vertical and horizontal characteristics of plasma depletions in the equatorial ionosphere. Those results have been used to generate the airglow signatures of two F-region emissions (6300 A and 7774 A) that can be used to relate observed morphologies to theoretical models. The airglow patterns that emerge show that the dominant features are enhancements in 6300 A levels to the east and west of the plasmas depletions, while at 7774 A the airglow signals show reductions coincident with the integrated plasma depletions. Recent airglow imaging data from Natal, Brazil, confirm the simulation results, showing that the formation and early-time behavior of ionospheric depletions can be studied by their airglow signatures observed from ground-based equatorial sites.

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