lundi 10 septembre 2018, par Atul MOHAN (Tata Institute of Fundamental Research, Pune, India)
Lundi 24 septembre 2018 à 11h00 , Lieu : Salle de rĂ©union du bâtiment 14
The talk will focus on the study of weak energy release events in the Corona using the powerful new technique of snapshot spectroscopic imaging with Murchison Widefield Array (MWA). MWA observes the Sun in a frequency range of 80- 240 MHz at a spectro-temporal resolution of 40 kHz and 0.5 s. We imaged two 4 min long and 15 MHz wide band datasets at 0.5s and 16kHz resolution. This was a period of very low solar activity as per the metrics of high energy observations. This lead to nearly 46,000 images which were converted to brightness temperature maps. I will brief the techniques we employ to extract useful physical information from such large volume of data spread across 4 axes, namely 2 angular sky coordinates, frequency and time. I will focus on one of the events we studied and the interesting physical inferences.
