The quiet Sun's magnetic flux estimated from Ca II H bright inter-granular G-band structures

Details The quiet Sun's magnetic flux estimated from Ca II H bright inter-granular G-band structures The quiet Sun's magnetic flux estimated from Ca II H bright inter-granular G-band structures

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...488.1101b&link_type=abstract

Astronomy and Astrophysics, Volume 488, Issue 3, 2008, pp.1101-1107

Astronomy and Astrophysics

Astrophysics

9

Sun: Magnetic Fields, Sun: Activity, Sun: Photosphere

Scientific paper

Aims: We determine the number density and area contribution of small-scale inter-granular Ca II bright G-band structures in images of the quiet Sun as tracers of kilo-Gauss magnetic flux-concentrations. Methods: In a 149 arcsec × 117 arcsec G-band image of the disk center at the activity minimum, 7593 small inter-granular structures were segmented with the “multiple-level tracking” pattern recognition algorithm. The scatterplot of the continuum versus the G-band brightness shows the known magnetic and non-magnetic branches. These branches are largely disentangled by applying an intrinsic Ca II H excess criterion. The thus obtained 2995 structures contain 1152 G-band bright points (BP) and 1843 G-band faint points (FP). They show a tendency toward increasing size with decreasing G-band excess, as expected from the “hot wall” picture. Their Ca II H and G-band brightness are slightly related, resembling the known relation of Ca II and magnetic field strength. The magnetic flux density of each individual BP and FP is estimated from their G-band brightness according to MHD model calculations. Results: The entity of BP and FP covers the total FOV with a number density of 0.32 / Mm2 and a total area contribution of 2.0%. Their individual calibrations yield a mean flux density of 20 Mx/cm2 in the entire FOV and 13 Mx/cm2 for inter-network regions.

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