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Isolated Sunspot with a Dark Patch in the Coronal Emission

Shibasaki, K.; Ryabov, B. I.; Bezrukov, D. A.

On the base of the 17 GHz radio maps of the Sun taken with the Nobeyama Radio Heliograph we estimate plasma parameters in the specific region of the sunspot atmosphere in the active region AR 11312. This region of the sunspot atmosphere is characterized by the depletion in coronal emission (soft X-ray and EUV lines) and the reduced absorption in t…