Magnetic bright points in the quiet Sun

Authors
Dr.
Jorge Sánchez Almeida
Date and time
13 May 2010 - 00:00 Europe/London
Address

Aula

Talk language
English
Slides language
English
Serie number
0
Description
We present a visual determination of the number of bright points (BPs) existing in the quiet Sun, which are structures though to trace intense kG magnetic concentrations. The measurement is based on a 0.1 arcsec angular resolution G-band movie obtained with the Swedish Solar Telescope at the solar disk center. We find 0.97 BPs/Mm2, which is a factor three larger than any previous estimate. It corresponds to 1.2 BPs per solar granule. Depending on the details of the segmentation, the BPs cover between 0.9% and 2.2% of the solar surface. Assuming their field strength to be 1.5 kG, the detected BPs contribute to the solar magnetic flux with an unsigned flux density between 13G and 33G. If network and inter-network regions are counted separately, they contain 2.2 BPs/Mm2 and 0.85 BPs/Mm2, respectively.