Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..567s&link_type=abstract
(Thermospheric and ionospheric dynamics; Symposium, Exeter, England, July 1989, Selected Papers. A92-10626 01-46) Journal of Atm
Physics
6
Doppler Effect, Equatorial Electrojet, F Region, Thermosphere, Wave Propagation, Gravity Waves, High Frequencies, Plasma Density, Plasma Frequencies, Refractivity
Scientific paper
The origin of short-period fluctuations from Doppler frequency-shift (P) data is investigated by examining their quantitative relationships with ambient electrojet strength and associated ionospheric conditions. The wave activity from 30-300 s is computed in terms of variations in P as synthesized through reverse FFT. P is found to vary linearly with ambient electrojet strength, and the Doppler fluctuations in the 30-300-s range tend to stop during partial or total counter-electrojet conditions. The highest sensitivity to changes in electrojet strength is noted in the 30-120-s region, and the spectral content of P fluctuations is dominated by the 120-210-s and 210-300-s subbands. The primary source of the short-period fluctuations in P data from the lower F-region reflections near the dip equator is the turbulent state of the diurnal electrojet.
Hanumath Sastri J.
Ramesh K. B.
Rao V. S. V. J.
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