Morphological study of post sunset secondary maximum in ionospheric electron content and its correlation with Faraday polarisation fluctuations and VHF amplitude scintillations at Delhi (original) (raw)

1990

Abstract

Continuous data on the ionospheric electron content (IEC) over Delhi are reported with special attention given to the nocturnal anomalous enhancements. The morphology of the post-sunset secondary maximum (PSSM) is isolated to determine whether there exist any correlative behavior with amplitude scintillations (AS) and/or Faraday polarization fluctuations (FPFs). Data from the periods Nov. 1975 - Aug. 1976 and Apr. 1978 - Dec. 1980 are reviewed to identify PSSMs, the time of PSSM peak, duration, and peak amplitude. The PSSM is found to have both seasonal and solar-cycle dependence including: (1) more frequent occurrence in winter; (2) an average IEC during the winter similar to the noontime maximum around the autumnal equinox; and (3) no maximum during the months of the equinox. FPFs occur only on days when both amplitude scintillations and a secondary maximum are present.

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