GMRT and Solar Radio Observations

Details GMRT and Solar Radio Observations GMRT and Solar Radio Observations

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..37a&link_type=abstract

2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe

Astronomy and Astrophysics

Astrophysics

Scientific paper

ananth@ncra.tifr.res.in We, briefly describe the Giant Metrewave Radio Telescope (GMRT) which is one of the most sensitive radio instruments in the world, operating in the frequency range 150-1450 MHz. Although it is a high resolution aperture synthesis array for observing compact and extended galactic and extra galactic sources, we show that it is a very useful instrument for observing the Sun in the above frequency range. We have used it for observing flares, noise storms and coronal holes. In particular, we describe the recent GMRT 150 MHz observations of a coronal hole with a dynamic range of >20 dB. A comparison of the radio map with a resolution of about a minute of arc with the EUV data from SOHO/EIT and the corresponding SXR data from GOES SXI instruments shows that the total extension of the coronal hole is similar and the systematic shift in the position of the mid-points of the maps allows us to make an estimate of the average distance/height between the three emission regions, by assuming the shifts to be due to simple projection effects.

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