Volume 422, Number 3, August II 2004
|Page(s)||L63 - L66|
|Published online||16 July 2004|
Letter to the Editor
Brightness and size of small-scale solar magnetic flux concentrations
Universitäts-Sternwarte, Geismarlandstraße 11, 37083 Göttingen, Germany e-mail: firstname.lastname@example.org
2 Institut für Geophysik, Astrophysik und Meteorologie, Universitätsplatz 5, 8010 Graz, Austria
Accepted: 22 June 2004
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.
Key words: Sun: photosphere / magnetic fields
© ESO, 2004
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