Abstract Details
| Name: M. Syed Ibrahim Affiliation: Madurai Kamaraj University Conference ID: ASI2017_1295 Title : Major Geo-effective Solar Eruptive Event on 2015 June 21 Authors and Co-Authors : M. Syed Ibrahim, Bhuwan Joshi, A. Shanmugaraju Abstract Type : Poster Abstract Category : Sun and the Solar System Abstract : We analyzed a major geo-effective Coronal Mass Ejection (CME) on 2015 June 21. The source region of this CME lies in active region NOAA 12371 where two M-class solar flares occurred between 01:00 UT and 04:00 UT. These flares and high speed CME (V = 1366 km/s) were observed by Solar Dynamics Observatory (SDO) and Large Angel Spectrometric Coronagraph/ Solar and Heliospheric observatory (LASCO/SOHO) respectively. The ICME associated with this CME caused a strong geo-magnetic storm of Dst = -204 nT. These strong flares occurred in a complex sunspot group where merging of positive and negative polarities is observed from Helioseismic and Magnetic Imager (HMI) observations. During the eruption phase, an active region filament broke out from the chromospheric heights as observed from GONG H-alpha filtergrams during the first M-class flare. Main aim of this paper is to investigate the initiation mechanism of the filament eruption, radiative signatures of corresponding solar flares along with the interplanetary propagation and geo-effectiveness of the associated CME. The interplanetary propagation of CME and its shock transit times are studied using the Drag Based Model (DBM) and the Empirical Shock Arrival model (ESA) respectively. Transit time of the CME is obtained from Advances and Composition Explorer (ACE)/Wind observations and it is compared with the estimated transit time. |