Abstract
High-resolution observations of polar crown and high-latitude filaments are scarce. We present a unique sample of such filaments observed in high-resolution H\(\upalpha \) narrow-band filtergrams and broad-band images, which were obtained with a new fast camera system at the Vacuum Tower Telescope (VTT), Tenerife, Spain. The Chromospheric Telescope (ChroTel) provided full-disk context observations in H\(\upalpha\), Ca ii K, and He i 10830 Å. The Helioseismic and Magnetic Imager (HMI) and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO) provided line-of-sight magnetograms and ultraviolet (UV) 1700 Å filtergrams, respectively. We study filigree in the vicinity of polar crown and high-latitude filaments and relate their locations to magnetic concentrations at the filaments’ footpoints. Bright points are a well studied phenomenon in the photosphere at low latitudes, but they were not yet studied in the quiet network close to the poles. We examine size, area, and eccentricity of bright points and find that their morphology is very similar to their counterparts at lower latitudes, but their sizes and areas are larger. Bright points at the footpoints of polar crown filaments are preferentially located at stronger magnetic flux concentrations, which are related to bright regions at the border of supergranules as observed in UV filtergrams. Examining the evolution of bright points on three consecutive days reveals that their amount increases while the filament decays, which indicates they impact the equilibrium of the cool plasma contained in filaments.
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Acknowledgements
The Vacuum Tower Telescope (VTT) at the Spanish Observatorio del Teide of the Instituto de Astrofísica de Canarias is operated by the German consortium of the Leibniz-Institut für Sonnenphysik (KIS) in Freiburg, the Leibniz-Institut für Astrophysik Potsdam (AIP), and the Max-Planck-Institut für Sonnensystemforschung (MPS) in Göttingen. ChroTel is operated by the KIS in Freiburg, Germany, at the Spanish Observatorio del Teide on Tenerife (Spain). The ChroTel filtergraph was developed by the KIS in cooperation with the High Altitude Observatory (HAO) in Boulder, Colorado. Complementary H\(\upalpha \) full-disk data were provided by the Kanzelhöhe Solar Observatory, University of Graz, Austria. We acknowledge the support by grants DE 787/5-1 (CD, CK, MV) and VE 1112/1-1 (MV) of the German Research Foundation (DFG) and the support by the European Commission’s Horizon 2020 Program (CD, CK, MV) under grant agreements 824064 (ESCAPE – European Science Cluster of Astronomy & Particle physics ESFRI research infrastructures) and 824135 (SOLARNET – Integrating High Resolution Solar Physics). The authors thank Dr. Jürgen Rendtel, Godehard Monecke, and Karin Gerber for their technical support during the observing campaign at VTT and Dr. Horst Balthasar for fruitful discussions. We thank Dr. Ioannis Kontogiannis for his helpful comments on the manuscript.
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Diercke, A., Kuckein, C., Verma, M. et al. Filigree in the Surroundings of Polar Crown and High-Latitude Filaments. Sol Phys 296, 35 (2021). https://doi.org/10.1007/s11207-021-01776-7
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DOI: https://doi.org/10.1007/s11207-021-01776-7