Abstract Details

Name: Ram Ajor Maurya
Affiliation: National Institute of Technology Calicut
Conference ID: ASI2021_515
Title : Subsurface Flow Structures and Dynamics Underneath the Flaring and Quiescent Regions
Authors and Co-Authors : Ram Ajor Maurya (Department of Physics, National Institute of Technology Calicut, Kerala-673601)
Abstract Type : Oral
Abstract Category : Sun and the Solar System
Abstract : Solar active regions are intense magnetic field areas responsible for explosive events such as flares and CMEs. However, some of them are found to be highly energetic as compared to other regions. We have analyzed several such areas from solar cycles 23 and 24. In the descending phase of the solar cycle 23, two complex active regions NOAA 10486 and 10488, appeared on the earthside. The first one produced several energetic flares of unprecedented magnitudes such as X10/2B, X17/4B, and X28 during its disc passes in the Carrington rotation 2009. The observations show that it lasted much longer than a typical active region on the visible solar disc. Being super active and lasting longer makes it a particular type of area. To investigate the distinct characteristic properties of these ARs, we analyzed and compared the p-modes and sub-surface flow structures and dynamics over three Carrington rotations. We found that the emergence of magnetic flux in the active region NOAA 10486 was started in the previous Carrington rotation 2008 when it was on the solar disc's far side. In the next Carrington rotation 2010, it was named NOAA 10508 and lasted on the far side. One of the exciting results with this region is that the energetic flares occurred during the decay phase of sub-photospheric flow twists. The detailed results from the other ARs will be presented in the meeting.