Magnetic Field Structures in a Facular Region Observed by THEMIS and <Emphasis Type="Italic">Hinode</Emphasis> |
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| Authors: | Y Guo B Schmieder V Bommier S Gosain |
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| Institution: | (1) Institute of Physical and Theoretical Chemistry, Center of Biomolecular Magnetic Resonance, Goethe University, Max-von-Laue Str.7, 60438 Frankfurt am Main, Germany;(2) Provence Chemistry Laboratory, UMR 6264, Provence University, CNRS, 13397 Marseilles Cedex 20, France; |
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| Abstract: | We study the space – time distributions of intensity fluctuations in 2 – 3 hour sequences of multi-spectral, high-resolution,
high-cadence, broad-band filtergram images of the Sun made by the SOT – FG system aboard the Hinode spacecraft. In the frequency
range 5.5<f<8.0 mHz both G-band and Ca ii H-line oscillations are suppressed in the presence of magnetic fields, but the suppression disappears for f>10 mHz. By looking at G-band frequencies above 10 mHz we find that the oscillatory power, both at these frequencies and at
lower frequencies, lies in a mesh pattern with cell scale 2 – 3 Mm, clearly larger than normal granulation, and with correlation
times on the order of hours. The mesh pattern lies in the dark lanes between stable cells found in time-integrated G-band
intensity images. It also underlies part of the bright pattern in time-integrated H-line emission. This discovery may reflect
dynamical constraints on the sizes of rising granular convection cells together with the turbulence created in strong intercellular
downflows. |
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