Nighttime F2-layer peak height changes due to thermospheric winds

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Scientific paper

Simultaneous observations of F2-layer peak heights, from an ionosonde, and nighttime thermospheric neutral wind velocities inferred from measurements of Doppler shifts of the OI 630 nm airglow emission line, using a Fabry-Perot interferometer, have been carried out at Cachoeira Paulista (23 degS, 45 degW, dip latitude 16 degS), Brazil. The MSIS-86 neutral density model is used to calculate the F-layer balance heights (H_0) due only to diffusion and recombination processes. The observed meridional and zonal wind velocities and H_0 are used to estimate variations in the F2-layer peak heights (H_M). In this paper we present and discuss results from a comparison between the observed F2-layer peak heights and the estimated H_M variations produced by the observed meridional wind velocities along the magnetic field lines.

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