Infrared photometric results of a sunspot

Details Infrared photometric results of a sunspot Infrared photometric results of a sunspot

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..473s&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Sunspots: Infrared Photometry

Scientific paper

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 brightness temperatures was made where five different magnetic and nonmagnetic regions - quiet region (QR), faculae, pores, penumbra, and umbra - in the field of view can be clearly distinguished. Pores as well as the penumbra are surrounded by the facular regions consisting of several single facular elements. However, facular regions are also found in non-magnetic vicinity.

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