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Session: Heliophysics and the Solar System

Name: Dr. Kostas Moraitis (University of Ioannina)
Coauthors: Archontis Vasilis (University of Ioannina)
Zhuleku Juxhin (University of Ioannina)
Chouliaras George (University of St Andrews)
Type: Oral
Title: Understanding a flux emergence simulation through magnetic helicity
Abstract:

We study a resistive magneto-hydrodynamic (MHD) flux emergence simulation from the point of view of magnetic helicity. The simulation includes a twisted flux tube that emerges from below the photosphere into a model corona that has an oblique, ambient magnetic field, and where the process of partial ionization is also considered. We calculate relative magnetic helicity and its two components, often referred to as, the self and mutual helicities, in the volume above the photosphere, following the most accurate computation method. The evolution of these helicities indicate the occurrence of three events in the simulation. We study the morphological characteristics of each of them and relate them with the evolution of helicities around the events. The use of magnetic helicity helps us to identify that the three events are different in nature, and that they occur at different locations in the simulation volume.