Infrared photometric results of a sunspot
We obtained simultaneously recorded time series of broadband images of a sunspot close to the disk center at the German Vacuum Tower Telescope, Tenerife, in two wavelength bands at 0.56 μm and 1.55 μm. Maps of brightness difference images Tb(1.55 μm) and Tb(0.56 μm) were computed for the best image pairs. Furthermore, a scatter plot of the
Stangl, S. et al.
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2002