Association of mid-infrared solar plages with Calcium K line emissions and magnetic structures

Details Association of mid-infrared solar plages with Calcium K line emissions and magnetic structures Association of mid-infrared solar plages with Calcium K line emissions and magnetic structures

2007-08-16

arxiv.org/abs/0708.2261v3

vol. 120,pp. 16-19, 2008

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures. Accepted by PASP

Scientific paper

10.1086/525058

Solar mid-IR observations in the 8-15 micrometer band continuum with moderate angular resolution (18 arcseconds) reveal the presence of bright structures surrounding sunspots. These plage-like features present good association with calcium CaII K1v plages and active region magnetograms. We describe a new optical setup with reflecting mirrors to produce solar images on the focal plane array of uncooled bolometers of a commercial camera preceded by germanium optics. First observations of a sunspot on September 11, 2006 show a mid-IR continuum plage exhibiting spatial distribution closely associated with CaII K1v line plage and magnetogram structures. The mid-IR continuum bright plage is about 140 K hotter than the neighboring photospheric regions, consistent with hot plasma confined by the magnetic spatial structures in and above the active region

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