Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..12e..24r&link_type=abstract
Long Wavelength Astrophysics, 26th meeting of the IAU, Joint Discussion 12, 21 August 2006, Prague, Czech Republic, JD12, #24
Astronomy and Astrophysics
Astrophysics
Scientific paper
Radio astronomical study at low frequencies and interferometer observations especially are exposed to the effect of different phenomena in the space plasma both in the source itself and along the path of radio wave propagation. The space plasma result in various effects, e.g. absorption, scattering, refraction, a delay of the radio sources radiation, and the Faraday rotation. The phenomena are frequency dependent and prove themselves particularly brightly at longer wavelengths. Some of them change apparent structure of the source. Other can restrict the obtainable sensitivity, resolution etc. The experimental data relating to the effect of a scattering on electron density inhomogeneities of the space plasma obtained with decameter range interferometers URAN are presented. The data were obtained both at the time of the study of the angular structure of radio sources and during the special investigations. The scattering on the interstellar plasma inhomogeneities enlarges the apparent angular diameters so the highest resolution obtainable at the decameter wavelengths are limited about 1". Annual interferometer observations of the Crab compact radio source were used to determine the effect of the interplanetary plasma at various elongations. It was found that accessible values of the coherent integration time drop down to value less 1 sec with the elongation decreasing from 180 to 90 degrees. At the lower elongations the scattering becomes strong with the considerable increasing of the diameter of the observed source. Single dish observations of the ionosphere scintillation were carrying out with URAN-1 array. Diurnal and seasonal variations of the scintillation parameters and their effects on the accuracy of the decameter observations have been defined. The space and ionosperic plasma influence is taking into account when studying the angular structure of the radio sources at the decameter wavelengths and can be required in a designing of new low frequency instruments.
Rashkovskiy S. L.
Shepelyev V. A.
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