Magnetic Bright Points in the Quiet Sun

Sánchez-Almeida, J.; Bonet, J. A.; Viticchié, B.; Del Moro, D.
Referencia bibliográfica

The Astrophysical Journal Letters, Volume 715, Issue 1, pp. L26-L29 (2010).

Fecha de publicación:
5
2010
Número de autores
4
Número de autores del IAC
2
Número de citas
66
Número de citas referidas
55
Descripción
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 0farcs1 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.