Equatorial anomaly in ionospheric electron content and its relation to dynamo currents

Details Equatorial anomaly in ionospheric electron content and its relation to dynamo currents Equatorial anomaly in ionospheric electron content and its relation to dynamo currents

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....8810259b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 10259-10262.

Physics

15

Anomalies, Dynamo Theory, E Region, Equatorial Atmosphere, Ionospheric Electron Density, Daytime, Diurnal Variations, Ionospheric Currents, Latitude, Regression Analysis

Scientific paper

The total-electron-content (TEC) equatorial anomaly and its relation to the E-region currents are investigated on the basis of Faraday-rotation measurements on 140-MHz ATS-6 satellite radio-beacon signals obtained at six Indian-zone stations in 1975-1976. The equatorial current strength is taken from the difference in magnetic-field perturbations observed at dip latitudes of 1.7 and 9.5 deg N, and from the east-west drift of electrojet irregularities determined from backscatter radar measurements. The results of the statistical analysis are presented graphically and discussed. The TEC anomaly is found to depend on the current strength to about the same degree during winter, summer, and equinox periods, with the anomaly crest moving away from the equator as current strength increases. A linear dependence of the total anomaly ionization inventory on the equatorial current strength is also demonstrated.

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