Faraday polarization fluctuations of VHF geostationary satellite signals near the geomagnetic equator

Details Faraday polarization fluctuations of VHF geostationary satellite signals near the geomagnetic equator Faraday polarization fluctuations of VHF geostationary satellite signals near the geomagnetic equator

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.8821b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 1, 1987, p. 8821-8826. Research supported by the Ministry of Sci

Physics

3

Faraday Effect, Ionospheric Disturbances, Ionospheric Propagation, Linear Polarization, Magnetic Equator, Very High Frequencies, Ats 6, F Region, Power Spectra, Satellite Transmission

Scientific paper

A two-slope power law spectrum for the equatorial F region irregularities has been introduced into the theory of Faraday polarization fluctuations (FPF) in place of a single-slope power law spectrum. The break scale length, at which the transition from a shallow to a steep slope in the irregularity power spectrum occurs, is found to play an important role in determining the strength of FPF. Faraday rotation data for 40 and 140 MHz linearly polarized signals transmitted from the geostationary satellite ATS6 and received at the equatorial station Ootacamund are analyzed. FPF for the 140 MHz signal is found to be negligible, although the quadrature components from which the Faraday rotation angle is derived show large fluctuations in the event of strong amplitude scintillations. There is appreciable FPF for the 40-MHz signalin these cases, which is explained on the basis of the two-component nature of the irregularity power spectrum.

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