Pair separation of magnetic elements in the quiet Sun

Titulo: 
Pair separation of magnetic elements in the quiet Sun
Autores: 
Giannattasio, F; Berrilli, F; Biferale, L; Del Moro, D; Sbragaglia, M; Rubio, LB; Gosic, M; Suarez, DO
Resumen: 
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 gamma = 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 r(0). 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.
Autor principal: 
Giannattasio, F
Autor/es del IAA: 
Bellot Rubio, L.; Gosic, M.
DOI: 
10.1051/0004-6361/201424380
Revista: 
ASTRONOMY & ASTROPHYSICS
Fecha de publicación: 
2014/09
Volumen: 
569
Tipo de documento: 
Article
Palabras clave: 
Sun: photosphere; Sun: magnetic fields; Sun: granulation
Número de artículo: 
A121