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Umbral oscillations in a detailed model umbra (1982)

Thomas, J. H. ; Scheuer, M. A.

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Publication Date: 2019-06-28

Description: The Scheuer and Thomas (1981) theory of umbral oscillations as magneto-atmospheric wave resonant modes is extended and confirmed, by calculating the resonant modes of a more detailed model of the umbral atmosphere. The depths of forcing needed for the production of the 140-185 sec oscillation periods observed are in agreement with the depths of overstable convection found in such studies as that of Moore (1973) and Mullan and Yun (1973). The present study, along with those cited, offers a consistent explanation of umbral oscillations as a resonant response to oscillatory convection in the umbral subphotosphere. The response is in the form of a trapped, fast, magneto-atmospheric wave in the photosphere and chromosphere.

Keywords: SOLAR PHYSICS

Type: Solar Physics; 79; July 198

Format: text

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