DIFFUSION OF SOLAR MAGNETIC ELEMENTS UP TO SUPERGRANULAR SPATIAL AND TEMPORAL SCALES

Journal Article · Thu Jun 20 00:00:00 EDT 2013 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/770/2/L36· OSTI ID:22118748

Giannattasio, F.; Del Moro, D.; Berrilli, F. ^[1]; Rubio, L. Bellot; Gosic, M. ^[2]

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1. Dipartimento di Fisica, Universita di Roma Tor Vergata, Via della Ricerca Scientifica 1, I-00133 Rome (Italy)
2. Instituto de Astrofisica de Andalucia (CSIC), Apdo. de Correos 3004, E-18080 Granada (Spain)

The study of spatial and temporal scales on which small magnetic structures (magnetic elements) are organized in the quiet Sun may be approached by determining how they are transported on the solar photosphere by convective motions. The process involved is diffusion. Taking advantage of Hinode high spatial resolution magnetograms of a quiet-Sun region at the disk center, we tracked 20,145 magnetic elements. The large field of view ({approx}50 Mm) and the long duration of the observations (over 25 hr without interruption at a cadence of 90 s) allowed us to investigate the turbulent flows at unprecedented large spatial and temporal scales. In the field of view an entire supergranule is clearly recognizable. The magnetic element displacement spectrum shows a double-regime behavior: superdiffusive ({gamma} = 1.34 {+-} 0.02) up to granular spatial scales ({approx}1500 km) and slightly superdiffusive ({gamma} = 1.20 {+-} 0.05) up to supergranular scales.

• OSTI ID: 22118748
• Journal Information: Astrophysical Journal Letters, Vol. 770, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTRONOMY
ASTROPHYSICS
DIFFUSION
EMISSION SPECTRA
MAGNETISM
PHOTOSPHERE
SPACE DEPENDENCE
SPATIAL RESOLUTION
SUN
TIME DEPENDENCE
TURBULENT FLOW