Multifrequency spectra of day-time ionospheric amplitude scintillations near the dip equator

Details Multifrequency spectra of day-time ionospheric amplitude scintillations near the dip equator Multifrequency spectra of day-time ionospheric amplitude scintillations near the dip equator

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jatp...48..463b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 48, May 1986, p. 463-469. Research supported by the Minist

Physics

5

Daytime, Equatorial Atmosphere, Ionospheric Propagation, Scintillation, Amplitude Distribution Analysis, Ionospheric Drift, Power Spectra

Scientific paper

Power spectra of daytime amplitude scintillations on VHF and UHF signals from the geostationary satellite ATS-6, received at an equatorial station Ootacamund (magnetic dip 6 deg N) are studied in order to obtain information about long wavelength (greater than about 100 m) irregularities generated in the equatorial electrojet plasma. Some of these spectra show Fresnel oscillations, which are usually absent for nighttime amplitude power spectra, indicating the presence of a thin layer of irregularities rather than a thick one, as is the case at night. It is found that the drift speeds of irregularities estimated from the respective power spectra show expected variations with changes in the electrojet current strength. The high frequency asymptotes of power spectra yield a two-dimensional irregularity power spectrum index of 3.0 + or - 0.4 over a wavelength range of approximately 60-800 m, which is close to the value 8/3 predicted by the unified theory of type I and type II irregularities in the equatorial electrojet for the so-called inertial range of wavelengths.

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