Spectra of the AC electric fields in the post-sunset F-region at the magnetic equator

Details Spectra of the AC electric fields in the post-sunset F-region at the magnetic equator Spectra of the AC electric fields in the post-sunset F-region at the magnetic equator

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40..655n&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 5, May 1992, p. 655-662.

Computer Science

16

Alternating Current, Electric Fields, F Region, Magnetic Equator, Power Spectra, Magnetic Anomalies, Plasma Drift, Sunset

Scientific paper

Attention is given to the power spectra of the fluctuations in the East-West electric field in the postsunset F-region at the magnetic equator. The spectra reveal that the fluctuations consist of several components with periods varying from a few minutes to several tens of minutes. The dominant fluctuations have periods of the order of a few tens of minutes, with the most frequent being about 30 min; the periods exhibit no dependence on the level of magnetic gravity. The spectra also indicate that one component of the fluctuations, usually the component with a period of about 30 min, is amplified during the period of the upward drift enhancement and attains maximum amplitude at around the time of the evening downward reversal. In general, the fluctuations have minimum amplitude at around 22:00 LST. The characteristics of the spectra suggest that the frequently occurring medium scale gravity waves could be a source for the observed fluctuations in the East-West electric fields.

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