EDP Sciences
Free access
Volume 490, Number 3, November II 2008
Page(s) L23 - L26
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200810464

A&A 490, L23-L26 (2008)
DOI: 10.1051/0004-6361:200810464


Small-scale magnetic field dynamics on the Sun at high spatial and temporal resolution

N. Bello González1, O. Okunev1, 2, and F. Kneer1

1  Institut für Astrophysik, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
    e-mail: [nazaret;olok;kneer]@astro.physik.uni-goettingen.de
2  Central Astronomical Observatory of the Russian Academy of Sciences, Pulkovskoye chaussee 65/1, 196140 St. Petersburg, Russia

Received 25 June 2008 / Accepted 18 September 2008

Aims. We present examples of the time evolution of phenomena occurring in the quiet Sun photosphere as seen from observations of high spatial and spectral resolution and with a time cadence of 23 s.
Methods. A time sequence of about 5 min has been taken with the Göttingen Fabry-Perot spectropolarimeter at the VTT in the $\ion{Fe}{i}$ 6173 Å line. The data were reconstructed with speckle methods.
Results. With a polarimetric sensitivity of 2 $\times$ 10 $^{-3}~I_{\rm c}$ ( $\sigma_{\rm B}=2$ G), the formation of a bright point as seen from broadband and line-minimum intensities, as well as in magnetograms and Dopplergrams can be traced in detail. Other events, like a stable mixed-polarity configuration in the intergranules and the appearance of magnetic signature above granules in both dark and bright areas are presented.

Key words: Sun: magnetic fields -- techniques: high angular resolution -- techniques: polarimetric

© ESO 2008