Abstract Details
| Name: Yamini Rao Affiliation: IIT(BHU), Varanasi Conference ID: ASI2019_187 Title : Characterization of cool loop systems using multiple datasets as observed by Interface Region Imaging Spectrograph (IRIS) Authors and Co-Authors : Yamini K. Rao1, A. K. Srivastava1, P. Kayshap2, K. Wilhelm3 and B. N. Dwivedi1 1Department of Physics, Indian Institute of Technology (Banaras Hindu University), Varanasi, India 2Institute of Physics, University of South Bohemia,370 05, Ceske Budjovice, Czech Republic 3Max-Planck-Institute for Solar System, Gottingen, Jesus-von-Liebig-Weg 3, 37077, Germany Abstract Type : Oral Abstract Category : Sun and the Solar System Abstract : The loop structures present in the chromosphere and transition region of the solar atmosphere have low connectivity and low temperatures as compared to the coronal loops and commonly known as cool loop systems. Interface Region Imaging Spectrograph (IRIS) covers a broad range of inner atmosphere starting from photosphere to the transition region (TR) with high resolution. These cool loop structures are also considered as the manifestation of the highly dynamic plasma confined to the magnetic field lines present in the lower atmosphere. In order to study the plasma flows in the cool loop systems, we investigate the Doppler velocity for three different datasets using different spectral lines having different formation heights covering from near photosphere to the TR (Ni I (2799.47 A), Mg II k (2796.20 A), C II (1334.5 A), and Si IV (1402.77 A)). The radiance, Doppler velocity and FWHM maps are used to infer the various physical characteristics of such loop systems. The domination of blueshifts and redshifts at the footpoints of the cool loop systems show the plasma flow pattern there. The height dependent Doppler velocity variation has been studied using optically thick as well as optically thin lines. The multi-spectral study gives the mechanism of the formation of cool loop systems qualitatively. We obtain the inversion of the flows between Mg II k and Si IV line consistently in all three observational data sets related to the cool loop systems. |