Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 715, Issue 1, Pages L26-L29Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/715/1/L26
Keywords
Sun: activity; Sun: dynamo; Sun: granulation; Sun: photosphere; Sun: surface magnetism
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Funding
- Spanish Ministries of Education, and of Science and Innovation [AYA2007-66502, AYA2007-63881, ESP2006-13030-C06-04]
- EC [MTRN-CT-2006-035484]
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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 angular resolution G-band movie obtained with the Swedish Solar Telescope at the solar disk center. We find 0.97 BPs Mm(-2), which is a factor 3 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 13 G and 33 G. If network and inter-network regions are counted separately, they contain 2.2 BPs Mm(-2) and 0.85 BPs Mm(-2), respectively.
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