Abstract Details
| Name: Avijeet Prasad Affiliation: Indian Institute of Astrophysics Conference ID: ASI2015_807 Title : Topological properties of coronal fields derived from nonlinear force-free (NLFF) magnetic field solutions Authors and Co-Authors : A. Mangalam Indian Institute of Astrophysics, Bangalore Abstract Type : Oral Abstract Category : Sun and the Solar System Abstract : Simple axisymmetric nonlinear force-free (NLFF) magnetic fields are applied to simulate photospheric vector magnetograms. Based on these simulations, we build three-dimensional axisymmetric field configurations and calculate the energy and relative helicity for active regions (ARs). We also estimate the variation of twist angle as a function of height and calculate the mean crossing number of these braided magnetic fields which provides a lower bound for the free magnetic energy. We then examine the braiding in the magnetic field and find the distribution of crossing numbers obeyed by these structures. These results provide useful information on the coronal loop structure and also imply that the coronal heating can be supplied by the braiding in the case of the active sun. |