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- W2023576701 abstract "Abstract The ratio [O] [N2] is known to vary with season and latitude, creating some of the main climatological features of the F-region; storm-time responses are likewise linked to large-scale, slowly-varying, moving perturbations of the ratio. We develop an index based on the rate of change of foF22 during sunrise (Wright, 1963) which may have promise as an indicator of [O] [N2] . The index is easily defined from foF22 (cosχ) using a few hours' ionosonde observations near sunrise each day, extrapolated to the value of foF2 implied for an overhead sun (χ = 0). Electron content (TEC) data could be used in the same way. Only the first part of our study is reported here. It devises the index in a form suitable to modern digital ionosondes. A second part will derive the index for some 50 years of ionogram data which are now available in digital form. In a last part, we intend to test the historical index against available satellite measurements of [O] [N2] ." @default.
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- W2023576701 date "1998-01-01" @default.
- W2023576701 modified "2023-09-25" @default.
- W2023576701 title "A prospective ionospheric index of neutral thermospheric composition" @default.
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- W2023576701 doi "https://doi.org/10.1016/s0273-1177(98)00120-3" @default.
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