High-resolution observations of a light bridge in a decaying sunspot
Abstract
Light brigde are small-scale structures observed in the solar photosphere which separate the umbra of a sunspot in two or more parts. On 6 August 2011, we observed at the Swedish 1-m Solar Telescope a large sunspot of the Active Region NOAA 11263 with a light bridge. We acquired full Stokes profiles over the Fe I line at 630.25 nm and spectroscopic data along the Fe I line profile at 557.6 nm for about an hour, from 09:53:32 UT to 10:48:43 UT. Data in the core of the Ca II H line at 396.8 nm were simultaneously acquired. The Active Region was also observed by SDO and SOT/HINODE to study the dynamics and the magnetic evolution of the light bridge. Thanks to these high-resolution observations the fine structure of this element and its properties are better studied to determine the physical processes behind its formation.
- Publication:
-
Seventh European Summer School on Experimental Nuclear AstroPhysics
- Pub Date:
- May 2014
- DOI:
- 10.1063/1.4875316
- Bibcode:
- 2014AIPC.1595..221F