Dynamics of the quiet photosphere and its magnetic field under high spatial resolution
Abstract
An excellent 1 h 10 min time series of a quiet solar region near disk centre was acquired on 4th of May 2006 at the German Vacuum Tower Telescope. Using the new "Göttingen" Fabry-Perot interferometer together with the Kiepenheuer Adaptive Optics system spectropolarimetric images were obtained, scanning the Fe I 5247Å and Fe I 5250Å lines with a temporal cadence of 17 s each. Thanks to speckle reconstruction methods the achieved spatial resolution of the obtained intensity, velocity and magnetic field maps is ~ 0."3. First results on the dynamics of the quiet photosphere and magnetic fields reveal strengthening and weakening of the polarisation signal in interaction to granular convection processes indicating advection and diffusion of magnetic flux at smallest scales. Field structures, very elongated along intergranular lanes, show high dynamics, combine and split, and leave strong fingerprints at high photospheric layers where related temperatures fluctuate. Recent numerical MHD simulations come close to our findings. Possible indications of magnetic flux annihilation, flux tube evacuation or signs of upward-propagating shock fronts are illustrated.
- Publication:
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Modern solar facilities - advanced solar science
- Pub Date:
- 2007
- Bibcode:
- 2007msfa.conf..151P