Mesogranular structure in a hydrodynamical simulation

Matloch, Łukasz, Cameron, Robert, Shelyag, Sergiy, Schmitt, Dieter and Schüssler, Manfred (2010) Mesogranular structure in a hydrodynamical simulation. Astronomy & Astrophysics, 519. A52. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201014478

Abstract

Aims
We analyse mesogranular flow patterns in a three-dimensional hydrodynamical simulation of solar surface convection in order to determine its characteristics.

Methods
We calculate divergence maps from horizontal velocities obtained with the local correlation tracking (LCT) method. Mesogranules are identified as patches of positive velocity divergence. We track the mesogranules to obtain their size and lifetime distributions. We vary the analysis parameters to verify if the pattern has characteristic scales.

Results
The characteristics of the resulting flow patterns depend on the averaging time and length used in the analysis.

Conclusions
We conclude that the mesogranular patterns do not exhibit intrinsic length and time scales.

Item Type: Article
Uncontrolled Keywords: Sun: granulation, Sun: photosphere
Subjects: F300 Physics
F500 Astronomy
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Sergiy Shelyag
Date Deposited: 23 May 2016 14:29
Last Modified: 18 May 2017 06:50
URI: http://nrl.northumbria.ac.uk/id/eprint/26908

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