Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..142..157h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 142, no. 1, p. 157-170.
Astronomy and Astrophysics
Astronomy
18
Millimeter Waves, Multibeam Antennas, Radio Astronomy, Solar Radio Bursts, High Resolution, Horn Antennas
Scientific paper
A new method for the determination of the position of microwave burst sources on the sun, its implementation, and first observational results are presented. The 13.7 m antenna at Itapetinga with a five-channel receiver operating at 48 GHz and with a time resolution of 1 ms is used. Five horn antennas clustered around the focus of the Cassegrain reflector provide 5 beams diverging by about 2 arcmin. This configuration allows the observation of different parts of an active region and the determination of the center of the burst position with an accuracy of 5 to 20 arcsec depending on the angular distance relative to the antenna axis. The field of view is about 2 by about 4 arcsec. The time resolution of 1 ms is suitable to search for fast structures at 48 GHz. A total bandwidth of 400 MHz is used in order to achieve a sensitivity of 0.04 sfu sufficient for the detection of weak bursts. First observational results of the flare on May 11, 1991 show a well-located source position during all stages.
Correia Emilia
Costa Joaquim E. Rezende
Herrmann Richard
Kaufmann Patrik
Magun Andreas
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