Abstract Details
| Name: Rohit Sharms Affiliation: NCRA-TIFR Conference ID: ASI2015_595 Title : Characterising non-thermal emission features in the MWA solar dynamic spectra. Authors and Co-Authors : Rohit Sharma, Divya Oberoi and the MWA Collaboration Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : The Murchison Widefield Array (MWA) is a low radio frequency (80-300 MHz) SKA path-finder located at the site chosen for the SKA Western Australia. The Sun is known to be quite dynamic at these frequencies with emissions from mechanisms spanning a wide range of brightness temperatures. The MWA observations have further revealed the presence of short-lived, narrow-band weak emission features in the solar dynamic spectra even during relatively quiet solar periods. These time and frequency varying non-thermal emissions are superposed on the relatively steady and spectrally smooth blackbody emission from the million K corona, which forms the bulk of the solar emission at these frequencies. We have initiated a project to build quantitative estimates for the presence of these non-thermal features across the MWA observing band. We characterise these emissions by modelling the intensity distributions observed in the dynamic spectra using a Gaussian mixture approach and attempt to distinguish between the thermal and non-thermal emission components. This talk will present the initial results and the future plans for this effort. |