Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00470592" target="_blank" >RIV/67985815:_____/16:00470592 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1002/asna.201612432" target="_blank" >http://dx.doi.org/10.1002/asna.201612432</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/asna.201612432" target="_blank" >10.1002/asna.201612432</a>
Alternative languages
Result language
angličtina
Original language name
Spectropolarimetric observations of an arch filament system with the GREGOR solar telescope
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomische Nachrichten
ISSN
0004-6337
e-ISSN
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Volume of the periodical
337
Issue of the periodical within the volume
10
Country of publishing house
DE - GERMANY
Number of pages
7
Pages from-to
1050-1056
UT code for WoS article
000391297900010
EID of the result in the Scopus database
2-s2.0-84997754975