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An observational study of the interaction of impulsive and periodic perturbations in the solar atmosphere

Published online by Cambridge University Press:  25 May 2016

F.-L. Deubner  and
R. Kleineisel
F.-L. Deubner
Affiliation:
Astronomisches Institut Am Hubland, D-97074 Würzburg
R. Kleineisel
Affiliation:
Astronomisches Institut Am Hubland, D-97074 Würzburg

Abstract

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Time series of simultaneous high resolution filtergram observations in white light and in CaK2 have been employed to study the dynamical interdependence of the ‘low’ and the ‘high’ layers of the solar atmosphere, the 3-D propagation of perturbations in the stratification, and the excitation of p-mode and other oscillations. Impulsive and oscillatory perturbations have been isolated in the wavenumber and frequency regime, and their mutual interaction was also studied.

Several of our findings challenge interpretation and deserve further study.

  1. • The occurrence of a granule can be clearly recognized in the upper chromosphere.

  2. • A granule induces low brightness and low oscillation amplitudes at the CaK2 level, whereas the opposite happens at the intergranular border.

  3. • It is not always evident that the ‘source’ of the perturbation is located at the lower, i.e. the photospheric layer.

  4. • It is far from being clear which components of the various perturbations contribute to a net outward mechanical energy flux.

Type
Part IV: Inputs from helioseismology to solar physics
Information
Symposium - International Astronomical Union , Volume 181: Sounding Solar and Stellar Interiors , 1997 , pp. 307 - 314
Copyright
Copyright © Kluwer 1997 

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