Hostname: page-component-586b7cd67f-gb8f7 Total loading time: 0 Render date: 2024-11-25T04:12:04.319Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Abdelatif, T. E., Lites, B. W. and Thomas, J. H., 1986, Astrophys. J., 311, 1015.Google Scholar
Avrett, E. H., 1981, The Physics of Sunspots, ed. Cram, L. E. and Thomas, J. H., Sacramento Peak Observatory.Google Scholar
Evans, D. J. and Roberts, B., 1990, Astrophys. J., 348.Google Scholar
Gurman, J. B., 1987, Solar Phys., 108, 61.Google Scholar
Gurman, J. B. and Leibacher, J. W., 1984, Astrophys. J., 283, 859.Google Scholar
Lites, B. W., 1986, Astrophys. J., 301, 992.Google Scholar
Lites, B. W. and Thomas, J. H., 1985, Astrophys. J., 294, 682.Google Scholar
Mullan, D. J., 1974, Astrophys. J., 187, 621.Google Scholar
Musielak, Z. E. and Rosner, R., 1987, Astrophys. J., 315, 371.Google Scholar
Thomas, J. H. and Scheuer, M. A., 1982, Sotar Phys., 79, 19.Google Scholar
Yun, H. S., 1968, PhD thesis Indiana University.Google Scholar
Yun, H. S. and Lee, J. W., 1988, Vistas in Astronomy, 31, 129.Google Scholar
Zhugzhda, Y. D. and Locans, V., 1982, Solar Phys., 76, 77.Google Scholar
Zhugzhda, Y. D., Staude, J. and Locans, V., 1984, Solar Phys., 91, 219.Google Scholar
Zhugzhda, Y. D., Locans, V. and Staude, J., 1985, Solar Phys., 143, 201.Google Scholar