Association of mid-infrared solar plages with calcium K line emissions and magnetic structures
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Artigo
Date
2008
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Publications of the Astronomical Society of the Pacific
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7
Authors
Marcon R.
Kaufmann P.
Melo A.M.
Kudaka A.S.
Tandberg-Hanssen E.
Kaufmann P.
Melo A.M.
Kudaka A.S.
Tandberg-Hanssen E.
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Abstract
Solar mid-IR observations in the 8-15 μm band continuum with moderate angular resolution (18″) 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 2006 September 11 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. © 2008. The Astronomical Society of the Pacific. All rights reserved.