Abstract Details
| Name: Dr. Ramesh Chandra Affiliation: Kumaun University, Naintal Conference ID: ASI2017_945 Title : Recurrent solar eruptive flares on 2016 July 23 Authors and Co-Authors : Bhuwan Joshi Udaipur Solar Observatory, Physical Research Laboratory, Udaipur 313 004 Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : We present a multi-wavelength study of three M-class solar flares from NOAA AR 12565 on 2016 July 23. These flares were well observed by Solar Dynamic Observatory (SDO) and Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) in (E)UV and X-ray wavelengths. All three flares are associated with CMEs. The first flare was associated with very faint and narrow CME. The second flare is accompanied with broad CME. In the case of third flare, the associated CME was started as very bright blob like ejection. The blob like plasma structure appears up to 3 Rsun distance. The third flare was associated with type II radio burst. However, in case of first and second flare there was no type II radio burst. RHESSI observations reveal intense HXR bursts associated with these flares. The HXR sources comprise of distinct emission centroids corresponding to coronal loop-top and foot-point emissions. The non-thermal HXR spectrum extends up to ~100 keV for the first event. The second and third events are associated with very strong HXR bursts up to ~300 keV. Using the magnetic field data, we have explored the possibility that within a same active region why the first CME was very poor and the second and third flares were associated with stronger CMEs. |