Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002basi...30..871s&link_type=abstract
Bulletin of the Astronomical Society of India, vol. 30, p.871-879
Astronomy and Astrophysics
Astronomy
Solar: Photosphere, Magnetic Fields
Scientific paper
A gradient-based tessellating algorithm is used to study the magnetic field structure of the quiet Sun photosphere using SoHO full disk magnetograms. We find that the field is not uniformly distributed, but parcelled into flux concentrations. Both the flux and size of the concentrations are found to be described by broad, asymmetric distribution functions. Their mean absolute flux and size are found to be about 1.4 x 1018 mx and 6.1 Mm for both polarities in unsmoothed magnetograms at 5 gauss threshold. These values represent a weighted average for both network- and intranetwork magnetic fields, since the present method cannot currently distinguish between the two regions. Both flux and size distributions become more symmetric and less peaked in response to smoothing of images. Extrapolating this trend to sub-resolution scale, we note a linear decrease in size but a rapid increase in the mean absolute field strength, with asymptotic values of about 400 km and 50 gauss. This exercise shows that the true field strengths of quiet magnetic elements are higher and their size smaller than usually inferred from observations. This is because observation of mixed polarity regions under finite resolution causes the observed flux to be smeared out and apparently modified. Therefore, this flux cannot be interpreted independently of the geometric structure and flux distribution of the concentrations.
Bagare S. P.
Singh Jagdev
Srikanth Raghavendra
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