Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...382.1093t&link_type=abstract
Astronomy and Astrophysics, v.382, p.1093-1105 (2002)
Astronomy and Astrophysics
Astrophysics
12
Sun: Sunspots, Techniques: Image Processing
Scientific paper
The global brightness structure of a small sunspot is investigated. Seeing and instrumental effects are compensated by application of the phase-diversity technique and a conventional deconvolution method. We calculate brightness temperatures for the reconstructed data in three simultaneously observed continuum bands of the solar spectrum (402.1 nm, 569.5 nm, 709.1 nm). The darkest umbral regions are on average 0.17Isun, 0.27Isun and 0.32Isun bright. The corresponding temperatures lie in the range around 4790 K, 4600 K and 4460 K. The spatially averaged penumbral brightness amounts to 0.72Isun, 0.81Isun and 0.85Isun, which corresponds to 5910 K, 5750 K and 5640 K, respectively. Although the spectral distribution of the umbral and penumbral intensities is consistent with former measurements, the derived values support the idea that there exist a real difference in the thermal properties between the umbrae of small and large sunspots.
Schmidt Wolfram
Tritschler Alexandra
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