Contributed Talk - Splinter Solar

Wednesday, 23 September 2020, 17:35   (virtual room L)

Filigree in the Surroundings of Polar Crown and High-latitude Filaments

A. Diercke [1,2], C. Kuckein [1], M. Verma [1], C. Denker [1]
[1] Leibniz-Institut für Astrophysik Potsdam (AIP), [2] Universität Potsdam

Bright points are a well studied phenomenon in the photosphere at low latitudes. However, we study filigree in the vicinity of polar crown and high-latitude filaments and relate their locations to magnetic concentrations at the filaments' footpoints. We used high-resolution observations in H-alpha broad-band images and H-alpha narrow-band filtergrams obtained with a new fast camera system at the Vacuum Tower Telescope (VTT), Tenerife, Spain. The Chromospheric Telescope (ChroTel) provided full-disk context observations; 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 UV filtergrams, respectively. We examined size, area, and eccentricity of bright points. The bright points are related to concentrations of magnetic flux, which appear as bright regions in UV filtergrams. Bright points at the footpoints of polar crown filaments are preferentially located at stronger magnetic flux concentrations. Examining the evolution of bright points on three consecutive days reveals that their amount increases while the filament decays.