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EP: Fachverband Extraterrestrische Physik
EP 11: Sun and Heliosphere IV
EP 11.2: Vortrag
Donnerstag, 3. April 2025, 14:00–14:15, ZHG101
High-resolution observations of small-scale activity in coronal hole plumes — •Ziwen Huang1, Chitta Lakshmi Pradeep1, Luca Teriaca1, Regina Aznar Cuadrado1, Hardi Peter1,2, Sami K. Solanki1, Thomas Wiegelmann1, and Ferdinand Plaschke3 — 1Max Planck Institute for Solar System Research, Göttingen, Germany — 2Institut für Sonnenphysik (KIS), Freiburg, Germany — 3Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, Germany
Coronal hole plumes, largely radial ray-like structures located in coronal holes, are key targets for studying magnetohydrodynamic waves and solar wind origins. The plume bases are riddled with small-scale transients. We study three plumes within an equatorial coronal hole observed on 13 October 2022 by the High Resolution EUV telescope, part of EUI on board Solar Orbiter. By applying two different identification techniques, we detect tens to hundreds of small-scale brightenings at the plume bases. The statistical analysis of their properties (intensity, lifetime, area, shape, velocity) indicates that the majority of the observed brightenings are characterized by their small-scale nature, transient behavior, and display slightly elongated morphologies near the plume bases. Most of the brightenings appear to move with a velocity component in the plane of sky of less than 10km/s. Their de-projected 3D velocities are found to be substantially lower than the apparent outflow velocities (about 100km/s) detected at greater heights. We propose that the base brightenings may be related to either wave-driven Type I spicules or interchanging reconnections.
Keywords: UV radiation; solar wind; corona