Faraday polarization fluctuations of VHF geostationary satellite signals near the geomagnetic equator
- Indian Inst. of Geomagnetism, Bombay (India)
A two-slope power law spectrum for the equatorial F region irregularities has been introduced in 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. Analysis of Faraday rotation data for 40- and 140-MHz linearly polarized signals transmitted form the geostationary satellite ATS6 and received at the equatorial station Ootacamund (magnetic dip 6{degrees}N) yielded the following results: (1) FPF for the 140-MHz signal is negligible (<{delta}{omega}{sup 2} > {sup 1/2} << 0.1 rad) although the quadrature components from which the Faraday rotation angle {omega} is derived show large fluctuations in the event of strong amplitude scintillations; (2) there is appreciable FPF (< {Delta} {Omega}{sup 2} > {sup 1/2} {ge} 0.1rad) for the 40-MHz signal in these cases, which is explained on the basis of the two-component nature of the irregularity power spectrum.
- OSTI ID:
- 5615046
- Journal Information:
- Journal of Geophysical Research; (United States), Vol. 92:A8; ISSN 0148-0227
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
F REGION
PLASMA DENSITY
IONOSPHERE
RADIOWAVE RADIATION
FLUCTUATIONS
DATA ANALYSIS
FARADAY EFFECT
GEOMAGNETIC EQUATOR
GROUND LEVEL
POLARIZATION
SATELLITES
SCINTILLATIONS
SIGNALS
WAVE PROPAGATION
EARTH ATMOSPHERE
ELECTROMAGNETIC RADIATION
LEVELS
PLANETARY IONOSPHERES
RADIATIONS
VARIATIONS
661320* - Auroral
Ionospheric
& Magnetospheric Phenomena- (1992-)