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Title

On the Magnetic Nature of an Exploding Granule as Revealed by Sunrise/IMaX

AuthorsGuglielmino, Salvo L.; Pillet, Valentín Martínez; Ruiz Cobo, Basilio; Bellot Rubio, Luis R. ; Toro, José Carlos del ; Solanki, Sami K.; Riethmüller, Tino L.
KeywordsSolar granulation
Solar granules
Mesogranulation
Solar photosphere
Solar magnetic fields
Solar magnetic flux emergence
Spectropolarimetry
Issue DateJun-2020
PublisherIOP Publishing
CitationAstrophysical Journal 896(1): 62 (2020)
AbstractWe study the photospheric evolution of an exploding granule observed in the quiet Sun at high spatial (similar to 03) and temporal (31.5 s) resolution by the imaging magnetographSunrise/IMaX in 2009 June. These observations show that the exploding granule is cospatial to a magnetic flux emergence event occurring at mesogranular scale (up to similar to 12 Mm(2)area). Using a modified version of the SIR code for inverting the IMaX spectropolarimetric measurements, we obtain information about the magnetic configuration of this photospheric feature. In particular, we find evidence of highly inclined emerging fields in the structure, carrying a magnetic flux content up to similar to 4 x 10(18)Mx. The balance between gas and magnetic pressure in the region of flux emergence, compared with a very quiet region of the Sun, indicates that the additional pressure carried by the emerging flux increases the total pressure by about 5% and appears to allow the granulation to be modified, as predicted by numerical simulations. The overall characteristics suggest that a multipolar structure emerges into the photosphere, resembling an almost horizontal flux sheet. This seems to be associated with exploding granules. Finally, we discuss the origin of such flux emergence events. © 2020. The Author(s). Published by the American Astronomical Society.
DescriptionOpen Access. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Publisher version (URL)http://dx.doi.org/10.3847/1538-4357/ab917b
URIhttp://hdl.handle.net/10261/216435
DOIhttp://dx.doi.org/10.3847/1538-4357/ab917b
ISSN0004-637X
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