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Time Variation of Velocity Flows from Ring Diagrams: A First Approach

Published online by Cambridge University Press:  08 February 2017

J. Patrón ,
I. González Hernández ,
D.-Y. Chou  and
The Ton Team
J. Patrón
Affiliation:
Instituto de Astrofísica de Canarias
I. González Hernández
Affiliation:
Instituto de Astrofísica de Canarias
D.-Y. Chou
Affiliation:
Physics Department, Tsing Hua University

Extract

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The Ring Diagram analysis is a technique designed to infer the presence of horizontal velocity flows under the solar surface by the analysis of the power spectra of solar oscillations in three dimensions: the two components of the horizontal wave number and temporal frequency (Hill, 1988 and Patrón et al., 1995). This procedure is applied as a local analysis technique, performed for a region of the Sun of several heliographic degrees (typically around 15×15 degrees square). As the Sun is rotating, we must track a chosen region as long as it is present at the visible part of the solar disk, and we can continue the tracking after several solar rotations. The comparison of the estimated flow fields obtained at different times can give some ideas about the temporal variations of the flows.

Type
III. Large-Scale Structure of the Sun
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 175 - 176
Copyright
Copyright © Kluwer 1998 

References

Chou, D., et al, 1995, Solar Physics, 160, 237.CrossRefGoogle Scholar
Hill, F. 1988, Ap. J., 333, 996.CrossRefGoogle Scholar
Patrón, J., Hill, F., Rhodes, E.J. Jr., Korzennik, S.G., and Cacciani, A., 1995, Ap. J., 455, 476.CrossRefGoogle Scholar