Development of Semi-VLBI System and Observation of Sun at 21 cm

Details Development of Semi-VLBI System and Observation of Sun at 21 cm Development of Semi-VLBI System and Observation of Sun at 21 cm

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jkas...39...51p&link_type=abstract

Journal of the Korean Astronomical Society, vol. 39, no. 2, pp. 51-56

Astronomy and Astrophysics

Astronomy

1

Instrumentation: Interferometer, Sun: General, Sun: Radio Radiation, Radio Continuum: General

Scientific paper

We report the development of a semi-VLBI observation system operating at 21 cm and present the measurement of visibility function toward the sun using this system. The system consists of two 2.3 meter antennas with a maximum separation of 35 meter, a conventional high speed data acquisition system, and a set of programs for software correlation. Since two local oscillators of receiver modules are independent, data had to be fringe-fitted to yield the visibility amplitude. It is found that the visibility amplitude decreases and then bounces back as baseline increases. We confirm that solar disk with brighter limb best explains the measured visibility amplitude.

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