Ionospheric scintillation observations with radio interferometry

Details Ionospheric scintillation observations with radio interferometry Ionospheric scintillation observations with radio interferometry

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57...85s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 1, p. 85-97

Astronomy and Astrophysics

Astronomy

1

Analytic Functions, Earth Ionosphere, Interferometry, Ionospheric F-Scatter Propagation, Radio Wave Refraction, Radio Waves, Scintillation, Mathematical Models, Radio Astronomy, Signal Analysis

Scientific paper

Radio astronomical interferometric observations are affected by atmospheric refraction, being particularly sensitive to inhomogeneities in the atmosphere. At frequencies below 2 GHz the influences of the ionosphere are significant in radio astronomy, especially for single dish observations and for connected element interferometry. Analytical expressions for the manifestations of weak ionospheric scintillation in radio interferometric observations, are derived. We indicate which ionospheric scintillation parameters can be derived from radio interferometric measurements. It is shown that the baseline dependence of the observed amplitude scintillation index implies a direct determination of the height of the region of random irregular electron distribution. Furthermore, the linear scale of the irregularities causing scintillation can be determined directly from the baseline dependence of the scintillation index S(sub 4). From the mean square phase fluctuations as a function of interferometer baseline, the spatial scale of the irregularities responsible for this effect can also be determined. From a comparison with observational mid-latitude data we find indications that scintillation irregularities occur in the lower parts of the F2-layer. The spatial scale of irregularities causing amplitude scintillation is of the order of about 25 to about 500 meters. Phase scintillations are caused by irregularities with dimensions which are an order of magnitude larger.

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