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Granular cells in the presence of magnetic field

Published online by Cambridge University Press:  12 September 2017

J. Jurčák ,
B. Lemmerer  and
M. van Noort
J. Jurčák
Affiliation:
Astronomical Institute ASCR, Fričova 298, 251 65 Ondřejov, Czech Republic email: jurcak@asu.cas.cz
B. Lemmerer
Affiliation:
Institute of Physics, IGAM, University of Graz, Universitätsplatz 5, 8010 Graz, Austria email: birgit.lemmerer@uni.graz.at
M. van Noort
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany email: vannoort@mps.mpg.de
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Abstract

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We present a statistical study of the dependencies of the shapes and sizes of the photospheric convective cells on the magnetic field properties. This analysis is based on a 2.5 hour long SST observations of active region NOAA 11768. We have blue continuum images taken with a cadence of 5.6 sec that are used for segmentation of individual granules and 270 maps of spectropolarimetric CRISP data allowing us to determine the properties of the magnetic field along with the line-of-sight velocities. The sizes and shapes of the granular cells are dependent on the the magnetic field strength, where the granules tend to be smaller in regions with stronger magnetic field. In the presence of highly inclined magnetic fields, the eccentricity of granules is high and we do not observe symmetric granules in these regions. The mean up-flow velocities in granules as well as the granules intensities decrease with increasing magnetic field strength.

Keywords

Sun: granulationSun: photospheretechniques: polarimetric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S327: Fine Structure and Dynamics of the Solar Atmosphere , October 2016 , pp. 34 - 39
Copyright
Copyright © International Astronomical Union 2017 

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