Diffusion of solar magnetic elements up to supergranular spatial and temporal scales

Abstract

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 20145 magnetic elements. The large field of view (~50 Mm) and the long duration of the observations (over 25 hours without interruption at a cadence of 90 seconds) allowed us to investigate the turbulent flows at unprecedented large spatial and temporal scales. In the field of view, in fact, an entire supergranule is clearly recognizable. The magnetic elements displacement spectrum shows a double-regime behavior: superdiffusive (gamma=1.34 +/- 0.02) up to granular spatial scales (~1500 km), and slightly superdiffusive (gamma=1.20 +/- 0.05) up to supergranular scales.

This paper has been withdrawn due to the removal of all LaTeX symbols in the online Abstract. This paper was accepted for publication in ApJ Letters

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Cited by in corpus (21)

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• Polarised kink waves in magnetic elements: evidence for chromospheric helical waves
• Pair separation of magnetic elements in the quiet Sun
• Supergranular turbulence in a quiet Sun: Lagrangian coherent structures
• The relation between photospheric supergranular flows and magnetic flux emergence
• The spectrum of kink-like oscillations of solar photospheric magnetic elements
• Kinematics of Magnetic Bright Features in the Solar Photosphere
• Analysis of quiet-sun turbulence on the basis of SDO/HMI and Goode Solar Telescope data
• Super-diffusion versus competitive advection: a simulation
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• Analysis of Pseudo-Lyapunov Exponents of Solar Convection Using State-of-the-Art Observations
• Dispersion of small magnetic elements inside active regions on the Sun
• Observational characterisation of large-scale transport and horizontal turbulent diffusivity in the quiet Sun
• N-body model of magnetic flux tubes reconnecting in the solar atmosphere
• High-resolution spectropolarimetric observations of the temporal evolution of magnetic fields in photospheric bright points