Physics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.1391k&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 1391-1403.
Physics
1
Scientific paper
Longitudinal variations of the vertical plasma drift W produced for any particular local time at middle latitudes of the northern hemisphere by the neutral winds from the horizontal wind model HWM-90, and longitudinal variations of the height of the F2-layer peak hmF2 from the ionospheric model IRI-86, are approximated by the sum of two zonal harmonics (waves) with zonal wave numbers m = 1 and 2. Diurnal and seasonal variations of (m = 1, m = 2) amplitudes and phases are investigated (by phase is meant the longitude λ where the crest of the wave is located). It is shown that m = 2 longitudinal variations in hmF2 are produced mainly by the existence of m = 2 longitudinal variations of the vertical plasma drift, caused by the interaction of zonally-averaged thermospheric winds with the harmonic m = 2 in longitudinal variations of the geomagnetic field parameters. This suggests that zonally-averaged values of meridional and zonal winds can be derived from the Fourier-coefficients for cos 2λ and sin 2λ in longitudinal hmF2 variations. Two sets of relations for wind calculations are obtained - simple and complex. The simple relations do not take into account longitudinal neutral-air wind variations themselves when producing longitudinal W variations. The complex relations are obtained taking into account m = 2 longitudinal variations of the meridional wind. The method neglects the effects of the electric fields and a possible error due to neglecting by the electric fields is discussed. Zonally-averaged winds calculated at latitude 53°N from IRI-86 are in a reasonable agreement with winds predicted by the horizontal wind model HWM-90, although there are some differences in detail. To understand whether these differences are because of shortcomings in HWM-90 or in the suggested method, as well as to understand whether this method can be used for monitoring midlatitudinal thermospheric dynamics remotely, further investigations are needed.
Drobjeva Ja. V.
Khachikjan Ja. G.
Pogoreltsev A. I.
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