Pair separation of magnetic elements in the quiet Sun

DOI: 
10.1051/0004-6361/201424380
Publication date: 
01/09/2014
Main author: 
Giannattasio F.
IAA authors: 
Bellot Rubio L.;Gošić M.
Authors: 
Giannattasio F., Berrilli F., Biferale L., Del Moro D., Sbragaglia M., Bellot Rubio L., Gošić M., Orozco Suárez D.
Journal: 
Astronomy and Astrophysics
Publication type: 
Article
Volume: 
569
Pages: 
Number: 
A121
Abstract: 
The dynamic properties of the quiet Sun photosphere can be investigated by analyzing the pair dispersion of small-scale magnetic fields (i.e., magnetic elements). By using 25 h-long Hinode magnetograms at high spatial resolution ($0\3$), we tracked 68-490 magnetic element pairs within a supergranular cell near the disk center. The computed pair separation spectrum, calculated on the whole set of particle pairs independently of their initial separation, points out what is known as a super-diffusive regime with spectral index γ = 1.55 ± 0.05, in agreement with the most recent literature, but extended to unprecedented spatial and temporal scales (from granular to supergranular). Furthermore, for the first time, we investigated here the spectrum of the mean square displacement of pairs of magnetic elements, depending on their initial separation r0. We found that there is a typical initial distance above (below) which the pair separation is faster (slower) than the average. A possible physical interpretation of such a typical spatial scale is also provided. © ESO, 2014.
Database: 
WOK
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2014A&A...569A.121G/abstract
ADS Bibcode: 
2014A&A...569A.121G
Keywords: 
Sun: granulation; Sun: magnetic fields; Sun: photosphere