Abstract Details
| Name: Divya Oberoi Affiliation: NCRA-TIFR Conference ID: ASI2016_798 Title : Estimating the flux density and the brightness temperature of the Sun using a sky brightness model Authors and Co-Authors : Rohit Sharma, NCRA-TIFR Alan E. E. Rogers, MIT-Haystack Observatory, Westford, MA, USA Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : The new generation interferometric arrays are very well suited for spectroscopic imaging studies of the Sun. However the processing of these data with the high time and frequency resolution needed to capture the variations in solar radio emission is prohibitingly expensive in terms of both human and computational effort involved. Already the Murchison Widefield Array (MWA) project has amaased about 1.8 PB of solar data. There is, hence, a strong motivation to develop an automated and computationally lean analysis technique capable of extracting physically interesting information from these voluminous data. To meet this objective we have developed an approach to arrive at a flux density of the Sun using a sky model using the normalized cross-correlations (visibilities) measured on a low resolution interferometric baseline. This technique makes use of the fact that the MWA is a fairly well characterised instrument and the availability of a detailed and reliable model for the sky brightness distribution. Here we apply this technique it to data from the MWA and establish its robustness and reliability at determining solar flux density and average brightness temperatures. The ability of this technique to be able to estimate solar flux reliably with the native time and frequency resolution of the data provides us a very useful tool for studying the energetics of the weak short lived and narrow band emission features seen in the low radio frequency data. Some of its applications will be presented elsewhere in this meeting. |