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P: Fachverband Plasmaphysik
P 15: Astrophysical Plasmas
P 15.6: Vortrag
Mittwoch, 2. April 2025, 17:30–17:45, ZHG102
Stereoscopic observations reveal coherent morphology and evolution of solar coronal loops — •B. Ram1, L. P. Chitta1, S. Mandal1, H. Peter1, and F. Plaschke2 — 1Max-Planck-Institut für Sonnensystemforschung, Göttingen, Germany — 2Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
Coronal loops are bright, arched structures of magnetically confined, million-Kelvin plasma in the solar corona. The mechanisms responsible for heating these loops remain poorly understood. Investigation of the three-dimensional spatial morphology and temporal evolution of coronal loops will offer better insights into the underlying heating mechanisms. Some studies suggest that coronal loops may be optical illusions, resembling veils created by folds in two-dimensional sheets of plasma. Stereoscopic observations are, therefore, crucial to clarify their true morphology. We used high-resolution observations from the Extreme Ultraviolet Imager (EUI) on the Solar Orbiter and the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory to stereoscopically analyse coronal loops in an active region. Our analysis reveals that the loops exhibit nearly circular cross-sectional widths and consistent intensity variations along their lengths over a timescale of 30 minutes. These findings suggest that coronal loops are three-dimensional coherent plasma bundles that outline magnetic field lines indicating nanoflare heating rather than emissions caused by randomly aligned wrinkles in two-dimensional plasma sheets along the line of sight, as proposed by the 'coronal veil' hypothesis.
Keywords: Solar corona; Coronal loops; Solar magnetic fields; Coronal heating; EUV loops