Abstract Details

Name: Sanjay Kumar
Affiliation: Department of Physics, Patna University, Patna
Conference ID: ASI2021_127
Title : Magnetic reconnections in the presence of quasi-separatrix layers and three-dimensional magnetic nulls
Authors and Co-Authors : Dr. Sanjay Kumar (Department of Physics, Patna University, Patna-80005, India), Sushree S Nayak (Udaipur Solar Observatory, Physical Research Laboratory, Dewali, Bari Road, Udaipur-313001, India), Dr. Avijeet Prasad (Center for Space Plasma and Aeronomic Research, The University of Alabama in Huntsville, Huntsville, AL 35899, USA), Dr. Ramit Bhattacharyya (Udaipur Solar Observatory, Physical Research Laboratory, Dewali, Bari Road, Udaipur-313001, India)
Abstract Type : Poster
Abstract Category : Sun and the Solar System
Abstract : Three-dimensional (3D) magnetohydrodynamic simulations are carried out to explore magnetic reconnections in the presence of quasi-separatrix layers (QSLs) and 3D magnetic nulls. The initial magnetic fields are generated by superposing uniform vertical magnetic fields of two different magnitudes on a linear force-free field. The interior of the numerical box contains two 3D nulls with separatrix domes separated by a quasi-separator (or hyperbolic flux tube) with QSLs. In the first simulation, the uniform vertical field is so large that the nulls are located at low heights and the domes are separate. Initially unbalanced Lorentz forces drive rotational flows that form strong electric currents and strong torsional fan reconnection at the 3D nulls and weak QSL reconnection at the hyperbolic flux tube. Flipping or slipping of field lines is observed in both cases. In the second simulation, with a weaker vertical field and larger domes, the separatrix surfaces meet at the central quasi- separator and their rotation drives stronger QSL reconnection than the first simulation.