| Name: | Aswathi K |
| Affiliation: | Indian Institute of Science Education and Research (IISER), Thiruvananthapuram |
| Conference ID : | ASI2024_890 |
| Title : | Investigating Vortex Interaction and their Role in Heating of the Chromosphere |
| Authors : | Aswathi K, Arjun Kannan, Nitin Yadav |
| Authors Affiliation: | 1 School of Physics, Indian Institute of Science Education and Research
Thiruvananthapuram, Vithura,
Thiruvananthapuram
695551, Kerala, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract : | Vortex motions are ubiquitous and exhibit a wide variety of dynamics in the solar atmosphere. The role of vortices in the heating of the chromosphere is an active area of research apart from the existing magnetic reconnection theory. Gradient and curl of velocity fields are markers for potential kinematic vortex locations. The enhanced vorticity and swirling strength criterion are the two major methods of vortex detection. However, vorticity detects shear flows along with purely rotating flows.The regions characterized by heightened shear, even if they do not align with Alfven wave perturbations, play a pivotal role in heating due to significant gradients in both velocity and magnetic fields. Thus, photospheric vortices that are known to excite Alfven waves could also heat the chromospheric plasma at the locations with large shears via viscous and Joule dissipation. Besides, magnetic fields and vortices have uncanny similarities in terms of their evolution equation and dissipation. Therefore, we examine the interactions between vortices of opposite sense of rotation and propose vortex reconnection (when opposite rotating vortices merge) as a possible mechanism for chromosphere heating through viscous dissipation along with Joule dissipation at the sites where shear is large. Thus we propose that enhanced vorticity method would be a more appropriate method to study heating of the solar atmosphere via viscous and joule dissipation whereas swirling strength method is suitable to study the role of Alfven waves in heating. We also show enhanced relative poynting flux over vortices in comparison with their areal density as evidence for heating of the chromosphere.
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