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Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope
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SYSNO ASEP 0470592 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope Author(s) Balthasar, H. (DE)
Gömöry, P. (SK)
Gonzalez Manrique, S. J. (DE)
Kuckein, C. (DE)
Kavka, J. (SK)
Kučera, A. (SK)
Schwartz, P. (SK)
Vašková, R. (SK)
Berkefeld, T. (DE)
Collados Vera, M. (ES)
Denker, C. (DE)
Feller, A. (DE)
Hofmann, A. (DE)
Lagg, A. (DE)
Nicklas, H. (DE)
Orozco Suárez, D. (ES)
Pastor Yabar, A. (ES)
Schlichenmaier, R. (DE)
Schmidt, D. (DE)
Schmidt, W. (DE)
Sigwarth, M. (DE)
Sobotka, Michal (ASU-R) RID, ORCID
Solanki, S.K. (DE)
Soltau, D. (DE)
Staude, J. (DE)
Strassmeier, K.G. (DE)
Volkmer, R. (DE)
von der Lühe, O. (DE)
Waldmann, T.A. (DE)Source Title Astronomische Nachrichten. - : Wiley - ISSN 0004-6337
Roč. 337, č. 10 (2016), s. 1050-1056Number of pages 7 s. Publication form Print - P Action Dynamic Sun - Exploring the Many Facets of Solar Eruptive Events Event date 26.10.2015 - 29.10.2015 VEvent location Potsdam Country DE - Germany Event type WRD Language eng - English Country DE - Germany Keywords Sun ; filaments ; photosphere Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics Institutional support ASU-R - RVO:67985815 UT WOS 000391297900010 EID SCOPUS 84997754975 DOI https://doi.org/10.1002/asna.201612432 Annotation Arch filament systems occur in active sunspot groups, where a fibril structure connects areas of opposite magnetic polarity, in contrast to active region filaments that follow the polarity inversion line. We used the GREGOR Infrared Spectrograph (GRIS) to obtain the full Stokes vector in the spectral lines SiI lambda 1082.7 nm, He I lambda 1083.0 nm, and Ca I lambda 1083.9 nm. We focus on the near-infrared calcium line to investigate the photospheric magnetic field and velocities, and use the line core intensities and velocities of the helium line to study the chromospheric plasma. The individual fibrils of the arch filament system connect the sunspot with patches of magnetic polarity opposite to that of the spot. These patches do not necessarily coincide with pores, where the magnetic field is strongest. Instead, areas are preferred not far from the polarity inversion line. These areas exhibit photospheric downflows of moderate velocity, but significantly higher downflows of up to 30 km s(-1) in the chromospheric helium line. Our findings can be explained with new emerging flux where the matter flows downward along the field lines of rising flux tubes, in agreement with earlier results. Workplace Astronomical Institute Contact Anežka Melichárková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2017
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