Computer Science
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..299b&link_type=abstract
(Middle and upper atmosphere results; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission C /Meeti
Computer Science
1
Doppler Radar, Electric Fields, F Region, Plasma Drift, Power Spectra, Fourier Analysis, Gravity Waves
Scientific paper
Power spectra of the fluctuating component of the east-west electric fields in the postsunset F region at the magnetic equator are presented. The electric fields were derived from vertical plasma drift observations conducted at Trivandrum (dip 0.9 deg S) by using a HF Doppler radar system. The spectra are found to have spikes, one dominant spike and one or two significant secondary spikes. The dominant spike has period in the range 13-32 min and amplitude 5-12 m/s. The periods and amplitudes of the secondary spikes are in the ranges 3-10 minutes and 2-5 m/s, respectively. The spectra show very little day-to-day variability and have no appreciable changes with geometric activity. The characteristics of the spectra suggest that the frequency occurring medium scale gravity waves could be a source for the observed fluctuations in the east-west electric fields in the equatorial postsunset F region.
Balan Nanan
Gopkumar G.
Nair R. B.
Rao Balarama P.
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