Abstracts Details


First Name * : C R
Last Name * : Sangeetha
Affiliation * : Udaipur Solar Observatory/Physical Research Laboratory
Abstract Type * : Poster
Title * : Magnetic and Kinetic helicity changes during M-class X-ray flares
Author(s) * : Sangeetha C. R., Durgesh Tripathi, Ravindra B., Sargam Mulay
Abstract Session * : Solar flares and coronal mass ejections
Abstract * : An enormous amount of energy are released during flares and their signatures has been observed over the entire electromagnetic spectrum. But the physics behind this is still not fully understood. In this work, we studied the changes observed in the photospheric magnetic and kinetic helicities before and during five M-class X-ray flares using the Helioseismic and Magnetic Imager (HMI) on board Solar Dynamics Observatory (SDO). The flare evolution was studied using 94 Ang channel of the Atmospheric Imaging Assembly (AIA) instrument. We investigated whether these physical quantities have any contribution as precursors of flares. We have found that the magnetic helicity was decreasing where as the kinetic helicity was increasing in the active region before the flare starts. During the flares, a these quantities were observed to decrease. Since the magnetic helicity is a conserved quantity, the increase in the kinetic helicity could be due to the transfer of magnetic helicity to the fluid motions. These physical quantities provided important insights into our understanding of solar flares and could be used for understanding the physics behind the flares in a better manner.