Volume 532, August 2011
|Number of page(s)||6|
|Published online||08 August 2011|
Is there a non-monotonic relation between photospheric brightness and magnetic field strength in solar plage regions?
Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
2 Technische Universität Braunschweig, Institut für Theoretische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany
Received: 15 April 2011
Accepted: 6 July 2011
Context. The relationship between the brightness and field strength of small-scale solar magnetic features is an important factor for solar irradiance variations and a constraint for simulations of solar magneto-convection.
Aims. We wish to clarify the origin of the apparent discrepancy between observational results and radiative MHD simulations.
Methods. Maps of (bolometric) brightness and magnetic field strength from the simulation of a plage region were convolved and rebinned to mimic observations obtained with telescopes with finite aperture.
Results. Image smearing changes the monotonic relation between brightness and field strength obtained at the original resolution of the simulation into a profile with a maximum at intermediate field strength, which is in qualitative agreement with the observations. This result is mainly due to the smearing of strong magnetic fields at the bright edges of magnetic structures into the weakly magnetized adjacent areas.
Conclusions. Observational and simulation results are qualitatively consistent with each other if the finite spatial resolution of the observations is taken into account.
Key words: Sun: surface magnetism / Sun: photosphere
© ESO, 2011
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.