Spectropolarimetric Observations of an Arch Filament System with GREGOR

0552747 - ASÚ 2022 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Balthasar, H. - Gömöry, P. - González Manrique, S. J. - Kuckein, C. - Kučera, A. - Schwartz, P. - Berkefeld, T. - Collados Vera, M. - Denker, C. - Feller, A. - Hofmann, A. - Schlichenmaier, R. - Schmidt, D. - Schmidt, W. - Sigwarth, M. - Sobotka, Michal - Solanki, S.K. - Soltau, D. - Staude, J. - Strassmeier, K.G. - von der Lühe, O.
Spectropolarimetric Observations of an Arch Filament System with GREGOR.
Solar Polarization Workshop 8. San Francisco: Astronomical Society of the Pacific, 2019 - (Belluzzi, I.), s. 217-222. ASP Conference Series, 526. ISBN 978-1-58381-939-5. E-ISSN 1050-3390.
[Solar Polarization Workshop 8. Florence (IT), 12.09.2016-16.09.2016]
GRANT EU: European Commission(XE) 312495 - SOLARNET
Institucionální podpora: RVO:67985815
Klíčová slova: arch filament system * observations * sunspot group
Obor OECD: Astronomy (including astrophysics,space science)

We observed an arch filament system (AFS) in a sunspot group with the GREGOR Infrared Spectrograph attached to the GREGOR solar telescope. The AFS was located between the leading sunspot of negative polarity and several pores of positive polarity forming the following part of the sunspot group. We recorded five spectro-polarimetric scans of this region. The spectral range included the spectral lines Si I 1082.7 nm, He I 1083.0 nm, and Ca I 1083.9 nm. In this work we concentrate on the silicon line which is formed in the upper photosphere. The line profiles are inverted with the code 'Stokes Inversion based on Response functions' to obtain the magnetic field vector. The line-of-sight velocities are determined independently with a Fourier phase method. Maximum velocities are found close to the ends of AFS fibrils. These maximum values amount to 2.4 km s-1 next to the pores and to 4 km s-1 at the sunspot side. Between the following pores, we encounter an area of negative polarity that is decreasing during the five scans. We interpret this by new emerging positive flux in this area canceling out the negative flux. In summary, our findings confirm the scenario that rising magnetic flux tubes cause the AFS.
Trvalý link: http://hdl.handle.net/11104/0327866