Brightness and size of small-scale solar magnetic flux concentrations

Details Brightness and size of small-scale solar magnetic flux concentrations Brightness and size of small-scale solar magnetic flux concentrations

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...422l..63w&link_type=abstract

Astronomy and Astrophysics, v.422, p.L63-L66 (2004)

Astronomy and Astrophysics

Astrophysics

24

Sun: Photosphere, Magnetic Fields

Scientific paper

The new 1 m Swedish Solar Telescope SST on La Palma allows to observe inter-granular G-band bright points (igBP) in solar active regions at an unprecedented spatial resolution. The igBP are reasonably assumed to be small-scale magnetic flux-concentrations. A sample of more than 1500 igBP shows tight relations of diameter and brightness in the G-band and in the continuum; it covers a diameter range of 100 km to 300 km, with a most frequent value near 160 km. Features larger than 300 km formerly reported, evidently result from insufficient spatial resolution; that upper diameter limit is close to the typical width of inter-granular lanes, and suggests a ``gap'' to small pores. The lack of igBP with sizes below 130 km is discussed not to arise from the finite spatial resolution of the 1 m telescope.

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