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The magnetic structure and dynamics of a decaying active region

Published online by Cambridge University Press:  24 September 2020

Ioannis Kontogiannis Open the ORCID record for Ioannis Kontogiannis [Opens in a new window] ,
Christoph Kuckein Open the ORCID record for Christoph Kuckein [Opens in a new window] ,
Sergio Javier González Manrique Open the ORCID record for Sergio Javier González Manrique [Opens in a new window] ,
Tobias Felipe Open the ORCID record for Tobias Felipe [Opens in a new window] ,
Meetu Verma Open the ORCID record for Meetu Verma [Opens in a new window] ,
Horst Balthasar Open the ORCID record for Horst Balthasar [Opens in a new window]  and
Carsten Denker Open the ORCID record for Carsten Denker [Opens in a new window]
Ioannis Kontogiannis
Affiliation:
Leibniz-Institut für Astrophysik (AIP), An der Sternwarte 16, 14482, Potsdam, Germany email: [email protected]
Christoph Kuckein
Affiliation:
Leibniz-Institut für Astrophysik (AIP), An der Sternwarte 16, 14482, Potsdam, Germany email: [email protected]
Sergio Javier González Manrique
Affiliation:
Astronomical Institute, Slovak Academy of Sciences, Tatranská Lomnica, Slovakia
Tobias Felipe
Affiliation:
Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife, Spain Universidad de La Laguna, Tenerife, Spain
Meetu Verma
Affiliation:
Leibniz-Institut für Astrophysik (AIP), An der Sternwarte 16, 14482, Potsdam, Germany email: [email protected]
Horst Balthasar
Affiliation:
Leibniz-Institut für Astrophysik (AIP), An der Sternwarte 16, 14482, Potsdam, Germany email: [email protected]
Carsten Denker
Affiliation:
Leibniz-Institut für Astrophysik (AIP), An der Sternwarte 16, 14482, Potsdam, Germany email: [email protected]
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Abstract

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We study the evolution of the decaying active region NOAA 12708, from the photosphere up to the corona using high resolution, multi-wavelength GREGOR observations taken on May 9, 2018. We utilize spectropolarimetric scans of the 10830 Å spectral range by the GREGOR Infrared Spectrograph (GRIS), spectral imaging time-series in the Na ID2 spectral line by the GREGOR Fabry-Pérot Interferometer (GFPI) and context imaging in the Ca IIH and blue continuum by the High-resolution Fast Imager (HiFI). Context imaging in the UV/EUV from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO) complements our dataset. The region under study contains one pore with a light-bridge, a few micro-pores and extended clusters of magnetic bright points. We study the magnetic structure from the photosphere up to the upper chromosphere through the spectropolarimetric observations in He II and Si I and through the magnetograms provided by the Helioseismic and Magnetic Imager (HMI). The high-resolution photospheric images reveal the complex interaction between granular-scale convective motions and a range of scales of magnetic field concentrations in unprecedented detail. The pore itself shows a strong interaction with the convective motions, which eventually leads to its decay, while, under the influence of the photospheric flow field, micro-pores appear and disappear. Compressible waves are generated, which are guided towards the upper atmosphere along the magnetic field lines of the various magnetic structures within the field-of-view. Modelling of the He i absorption profiles reveals high velocity components, mostly associated with magnetic bright points at the periphery of the active region, many of which correspond to asymmetric Si I Stokes-V profiles revealing a coupling between upper photospheric and upper chromospheric dynamics. Time-series of Na ID2 spectral images reveal episodic high velocity components at the same locations. State-of-the-art multi-wavelength GREGOR observations allow us to track and understand the mechanisms at work during the decay phase of the active region.

Keywords

Sun: atmosphereSun: chromosphereSun: magnetic fieldSun: photosphereSun: oscillations
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 53 - 57
Copyright
© International Astronomical Union 2020

References

Alissandrakis, C. E. 1981, A&A, 100, 197Google Scholar
Denker, C., Kuckein, C., Verma, M, et al., 2018, ApJSS, 236, 5CrossRefGoogle Scholar
Felipe, T., Kuckein, C., Khomenko, E., & Thaler, I. 2019, A&A, 621, A43Google Scholar
González Manrique, S. J., Kuckein, C., Collados, M., et al. 2018, A&A, 617, A55Google Scholar
Kontogiannis, I., Gontikakis, C., Tsiropoula, G. & Tziotziou, K. 2018, Sol Phys, 293, 56CrossRefGoogle Scholar
Kuckein, C. 2019, A&A, 630, A139Google Scholar
Kuckein, C., Denker, C, Verma, M, et al., 2017, IAU Symposium 327, 20CrossRefGoogle Scholar
Lagg, A., et al. 2014, A&A, 568, A60Google Scholar
Pesnell, W. D., Thompson, B. J., & Chamberlin, P. C., 2012, Sol Phys, 275, 3CrossRefGoogle Scholar
Puschmann, K. G., Denker, C., Kneer, F., et al., 2012, AN, 333, 880Google Scholar
Rutten, R., et al. 2011, A&A, 531, A17Google Scholar
Scherrer, P. H., Schou, J., Bush, R. I, et al., 2012, Sol Phys, 275, 207CrossRefGoogle Scholar
Schmidt, W., von der Lühe, O., Volkmer, R., et al., 2012, AN, 333, 796Google Scholar