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Abstract
The paper describes three antenna arrays used in conjunction with receiving and recording apparatus for some of the solar radio astronomy and ionospheric research problems at the Physical Research Laboratory, Ahmedabad.
Three pairs of cross-polarized rhombic antennas have been constructed to record the dynamic spectra of solar radio bursts covering the frequency range of 40–240 MHz. These are equatorially mounted and driven by a common synchronous motor to follow the sun continuously for about ±4 hours around the local noon.
A steerable broadside collinear array of 16 half wave dipoles backed by a reflector has been constructed for radio star scintillation studies at 110 MHz. This array is also equatorially mounted and can be used to follow a radio source continuously.
A simple radio interferometer, operating at 110 MHz, consisting of two Yagi antennae spaced 10 wavelengths apart has been constructed. This will be used for both the solar as well as radio star scintillation work.
The effective areas, matching of antennas to the respective receivers and sample recordings of the phenomena made by means of these antenna systems are discussed.