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The Generation of Long Period Acoustic Waves by Solar Global Oscillations

  • Bernhard Fleck
  • Friedrich Schmitz

Abstract

We study the response of a stratified isothermal atmosphere to long period disturbances with frequencies below the acoustic cut-off frequency ω co . Simulating the 5-min and other long period oscillations by a sinusoidally moving piston, we find that a few scale heights above the piston the atmosphere does not oscillate anymore with the excitation period but with the cut-off period (≈ 180s). We therefore suggest that the observed chromospheric 3-min oscillations are not due to a cavity but to a very simple — and in principle well known — basic effect of the dynamical behaviour of atmospheres, namely the excitation of the “cut-off frequency mode”.

Keywords

Evanescent Wave Scale Height Excitation Period Period Disturbance Partial Reflection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • Bernhard Fleck
    • 1
  • Friedrich Schmitz
    • 1
  1. 1.Institut für Astronomie und AstrophysikUniversität WürzburgWürzburgF.R.Germany

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