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A Possible Cause for Umbral Oscillations

Published online by Cambridge University Press:  25 April 2016

H. S. Yun ,
J. W. Lee  and
Y-J. Moon
H. S. Yun
Affiliation:
Department of Astronomy, Seoul National University, Republic of Korea
J. W. Lee
Affiliation:
Department of Astronomy, Seoul National University, Republic of Korea
Y-J. Moon
Affiliation:
Department of Astronomy, Seoul National University, Republic of Korea
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Abstract

An attempt has been made to examine the nature of 3-minute umbral oscillations in order to identify their origin. For this purpose we have calculated, on the basis of Musielak and Rosner (1987), the fast-mode energy spectra generated in a typical sunspot convection zone (Yun 1968). The computed energy spectrum is fed into the lower boundary of the sub-photospheric resonant cavity to examine the characteristics of the wave propagation through the SS umbral atmosphere (Avrett 1981). The upward velocity spectra computed at various heights are presented and their behaviour compared with observations.

Type
Solar & Solar System
Information
Publications of the Astronomical Society of Australia , Volume 9 , Issue 1 , 1991 , pp. 153 - 154
Copyright
Copyright © Astronomical Society of Australia 1991

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