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Signatures of the Impact of Flare-Ejected Plasma on the Photosphere of a Sunspot Light Bridge

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dc.contributor.author Felipe, T
dc.contributor.author Collados, M
dc.contributor.author Khomenko, E
dc.contributor.author Rajaguru, S. P
dc.contributor.author Franz, M
dc.contributor.author Kuckein, C
dc.contributor.author Asensio Ramos, A
dc.date.accessioned 2020-11-12T13:51:55Z
dc.date.available 2020-11-12T13:51:55Z
dc.date.issued 2017-12
dc.identifier.citation Astronomy & Astrophysics, Vol. 608, A97 en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6917
dc.description Restricted Access © ESO https://doi.org/10.1051/0004-6361/201731374 en_US
dc.description.abstract Aims. We investigate the properties of a sunspot light bridge, focusing on the changes produced by the impact of a plasma blob ejected from a C-class flare. Methods. We observed a sunspot in active region NOAA 12544 using spectropolarimetric raster maps of the four Fe i lines around 15 655 Å with the GREGOR Infrared Spectrograph, narrow-band intensity images sampling the Fe i 6173 Å line with the GREGOR Fabry-Pérot Interferometer, and intensity broad-band images in G -band and Ca ii H -band with the High-resolution Fast Imager. All these instruments are located at the GREGOR telescope at the Observatorio del Teide, Tenerife, Spain. The data cover the time before, during, and after the flare event. The analysis is complemented with Atmospheric Imaging Assembly and Helioseismic and Magnetic Imager data from the Solar Dynamics Observatory. The physical parameters of the atmosphere at di ff erents heights were inferred using spectral-line inversion techniques. Results. We identify photospheric and chromospheric brightenings, heating events, and changes in the Stokes profiles associated with the flare eruption and the subsequent arrival of the plasma blob to the light bridge, after traveling along an active region loop. Conclusions. The measurements suggest that these phenomena are the result of reconnection events driven by the interaction of the plasma blob with the magnetic field topology of the light bridge. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Methods: observational en_US
dc.subject Sun: flares en_US
dc.subject Sun: photosphere en_US
dc.subject Sun: magnetic fields en_US
dc.subject sun: activity en_US
dc.subject sunspots en_US
dc.title Signatures of the Impact of Flare-Ejected Plasma on the Photosphere of a Sunspot Light Bridge en_US
dc.type Article en_US


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