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Resonant Absorption of P-Modes by Sunspots

Published online by Cambridge University Press:  19 July 2016

S.M. Chitre  and
Joseph. M. Davila
S.M. Chitre
Affiliation:
Laboratory for Astronomy and Solar Physics NASA-Goddard Space Flight Center Greenbelt, MD 20771
Joseph. M. Davila
Affiliation:
Laboratory for Astronomy and Solar Physics NASA-Goddard Space Flight Center Greenbelt, MD 20771

Extract

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A substantial amount (≲50%) of solar acoustic (p-mode) absorption in sunspot regions has been reported by Braun, Duvall and LaBonte (1988). A number of suggestions have been advanced to account for the observed p-mode absorption in sunspots (see review by Davila in these proceedings). These include processes involving resonance absorption, radiation damping, and non-dissipative mechanisms. The main purpose of the present work is to demonstrate that any dissipative process like radiative, viscous, or resistive dissipation leads to the resonant absorption of acoustic waves incident on the sunspot tube and that the resultant heating rate can be shown to be consistent with the observed absorption of the p-mode power impinging on an isolated inhomogeneously structured sunspot.

Type
V. Photospheric Flux Tubes
Information
Symposium - International Astronomical Union , Volume 142: Basic Plasma Processes on the Sun , 1990 , pp. 187 - 188
Copyright
Copyright © Kluwer 1990 

References

Braun, D. C., Duvall, T. L., and LaBonte, B. J., 1988, Ap. J. , 335, 1015.Google Scholar
Davila, J. M., 1987, Ap. J. , 317, 514.Google Scholar
Hollweg, J. V., 1988, Ap. J. , 335, 1005.CrossRefGoogle Scholar
Lou, Y., 1989, Viscous Magnetohydrodynamic Modes and p-Mode Absorption by Sunspots, in press.Google Scholar