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

DOI: 
10.3847/1538-4357/ab917b
Publication date: 
01/06/2020
Main author: 
Guglielmino, Salvo L.
IAA authors: 
Bellot Rubio, Luis R.;del Toro Iniesta, José Carlos
Authors: 
Guglielmino, Salvo L.;Pillet, Valentín Martínez;Ruiz Cobo, Basilio;Bellot Rubio, Luis R.;del Toro Iniesta, José Carlos;Solanki, Sami K.;Riethmüller, Tino L.;Zuccarello, Francesca
Journal: 
The Astrophysical Journal
Refereed: 
Yes
Publication type: 
Article
Volume: 
896
Pages: 
62
Abstract: 
We study the photospheric evolution of an exploding granule observed in the quiet Sun at high spatial (∼0'3) and temporal (31.5 s) resolution by the imaging magnetograph Sunrise/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 ∼12 Mm<SUP>2</SUP> 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 ∼4 × 10<SUP>18</SUP> 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.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020ApJ...896...62G/abstract
ADS Bibcode: 
2020ApJ...896...62G
Keywords: 
UAT:1518;UAT:1498;UAT:2000;UAT:1503;UAT:1973;UAT:1028;UAT:1875;Astrophysics - Solar and Stellar Astrophysics