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A Spatial Analysis of Local Sources of Oscillation

Published online by Cambridge University Press:  08 February 2017

Y. Yan ,
F.-L. Deubner  and
R. Kleineisel
Y. Yan
Affiliation:
Astronomisches Institut, Universit5ät Würzburg, Am Hubland, 97074 Würzburg, Germany Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China
F.-L. Deubner
Affiliation:
Astronomisches Institut, Universit5ät Würzburg, Am Hubland, 97074 Würzburg, Germany
R. Kleineisel
Affiliation:
Astronomisches Institut, Universit5ät Würzburg, Am Hubland, 97074 Würzburg, Germany

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Recent observational studies of the spatial and temporal relations between impulsive and periodic perturbations (Deubner and Kleineisel, 1997; Espagnet et al., 1996; see also Goode et al., these proceedings) suggest that oscillations in the solar atmosphere are excited locally and stochastically by turbulent convection. Proper characterization of the dynamical processes involved requires careful analysis of the observations in the spatial as well as in the temporal domain. Wavelet transforms (Combes et al., 1984) allow the characterization of waveforms together with the temporal delays that occur between the observed fluctuations. We have employed Morlet wavelets (Daubechies, 1992) in the present analysis. In addition to the phase relation between convective eddies and the atmospheric waves we study in particular the 2-D spatial evolution of the perturbations, to better distinguish different modes of oscillation. The observational material used is the same as in Deubner and Kleineisel (1997).

Type
VII. The Solar Atmosphere
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 461 - 462
Copyright
Copyright © Kluwer 1998 

References

Combes, J. M., Grossmann, A., and Tchamitchian, Ph., (eds.): Wavelets, Springer-Verlag, Berlin, 1989.CrossRefGoogle Scholar
Daubechies, I.: Ten Lectures on Wavelets, SIAM, Philadelphia, 1992.CrossRefGoogle Scholar
Deubner, F.-L., and Kleineisel, R. in: Provost, J., Schmider, F.-X., (eds.): Sounding Solar and Stellar Interiors, Dordrecht, 1997 Google Scholar
Espagnet, O., Muller, R., Roudier, T., Mein, P., Mein, N., and Malherbe, J.M.: 1996, Astron. Astrophys., 313, 297.Google Scholar