Ionospheric plasma bubble encounters or F region bottomside traversals?

Computer Science – Sound

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F Region, Ionospheric Ion Density, Satellite Sounding, Space Plasmas, Atmospheric Composition, Equatorial Atmosphere, Explorer 51 Satellite, Explorer 55 Satellite, Ionospheric Electron Density, Molecular Ions, Oxygen Ions

Scientific paper

Data from in situ Atmospheric Explorer (AE) measurements and ground-based ionosonde measurements of the ion composition and concentration in the equatorial plasma bubbles are analyzed. The ionosonde produced data on the bottomside electron density (NE) profiles and aided in ascertaining the satellite measurements as being in the topside or bottomside of the F layer. The AE data were taken during low latitude evening conditions at various altitudes, and revealed ion compositions consistent with plasma bubbles originating at the altitude of the steep F region bottomside ionization gradient. The lifetimes of NO ions were observed to be short even if the ions were dominant in the regions where the bubbles form. Vertical distortions of tens of kilometers in the equatorial F region occurred in the unstable postsunset period to the extent that the bubble formation area and the bottomside plasma region became virtually indistinguishable.

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