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EP: Fachverband Extraterrestrische Physik

EP 6: Sun and Heliosphere III

EP 6.1: Hauptvortrag

Dienstag, 1. April 2025, 16:15–16:45, ZHG101

Decoding coronal loops: Structure and dynamics — •Sudip Mandal — Max Planck Institute for Solar System Research, Göttingen, Germany

Coronal loops, distinguished by their bright, curved, tube-like appearance, are among the most recognizable features of the solar corona. These loops are fundamental building blocks of the solar corona, making it essential to understand their properties in order to unravel the dynamics of the upper solar atmosphere. Despite several years of research, some of the key fundamental properties of these structures remain a mystery. For example, are these loops truly tube-like or sheet-like structures? If they are tube-like, are their cross-sections circular or elliptical? How do loops maintain their shape over several pressure scale heights, contrary to theoretical predictions? In this talk, I will provide key insights into these questions within the context of ESA's Solar Orbiter mission. Additionally, I will discuss the dynamics of these structures, particularly how coronal loops act as excellent waveguides that allow magnetohydrodynamic (MHD) waves to propagate and dissipate their energy at coronal heights, thereby contributing to the ongoing effort to solve the long-standing coronal heating problem.

Keywords: Sun; Solar corona; Coronal loops; MHD waves; Solar Orbiter