Evolution of Small-scale Magnetodynamics on the Sun with High Spatial and Temporal Resolution

Physics

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Scientific paper

For the detection and study of small-scale magnetic fields on the Sun, observations with both high spatial resolution and high polarimetric sensitivity are required. The combination formed by the upgraded Göttingen FPI spectrometer (spectral resolution of 25mÅ, at 617.3nm), full Stokes polarimeter, Adaptive Optics (KAOS) and speckle reconstruction techniques, provide broadband images of 0.25 arcsec spatial resolution and magnetograms of 0.33 arcsec, with minimised seeing induced signals yielding a polarimetric sensitivity of ~0.002 Ic. A description of the optical system as well as results from the analysis of intensity maps, Dopplergrams and magnetograms from quiet and active regions on the Sun will be presented. The data were taken in the FeI 6173Å. We select few examples from the huge variety of magnetodynamic processes seen in the observations, e.g. the fast evolution of a bright point in broadband and line minimum intensity, in magnetograms, and in Dopplergrams is shown. Further examples indicate convective collapse, magnetic field advection, and magnetic field diffusion.

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