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

Abstract

We study the photospheric evolution of an exploding granule observed in the quiet Sun at high spatial ($0.3^{\prime \prime }$) and temporal (31.5 s) resolution by the imaging magnetograph Sunrise/IMaX in June 2009. These observations show that the exploding granule is cospatial to a magnetic flux emergence event occurring at mesogranular scale (up 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 $4\times 10^{18}$ 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 by about 5% the total pressure and appears to allow the granulation to be modified, as predicted by numerical simulations. The overall characteristics suggest that a multi-polar 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.

19 pages, 12 figure + Appendix, accepted for ApJ. Figure 1 and Figure 5 are a low-quality version of the original ones

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Cited by in corpus (6)

• The European Solar Telescope
• Newly formed downflow lanes in exploding granules in the solar photosphere
• Analysis of Pseudo-Lyapunov Exponents of Solar Convection Using State-of-the-Art Observations
• Magnetic outbreak associated with exploding granulations
• Emergence of magnetic flux sheets in the quiet Sun. I. Statistical properties
• Morphological variations of solar granules in the presence of magnetic fields