A Two Cavity Model for Umbral Oscillations

Details A Two Cavity Model for Umbral Oscillations A Two Cavity Model for Umbral Oscillations

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jkas...20...27l&link_type=abstract

Journal of Korean Astronomical Society, vol. 20, no. 1, p. 27-47

Astronomy and Astrophysics

Astronomy

4

Scientific paper

In the present study a two-mode, separately concurring resonant cavity model is proposed for theorectical interpretation of the 3 minute umbral oscillation. The proposed model has been investigated by calculating the transmission coefficients of the waves propagating through the umbral photosphere (photospheric weak-field cavity) and chromosphere (chromospheric strong-field cavity) into the corona, for 3 different umbral model atmospheres by Staude (1982), Beebe et al. (1982) and Avrett (1981). In computing the transmission coefficients we made use of multi-layer approximation by representing the umbral atmosphere by a number of separate layers with (1) temperature varying linearly with depth and (2) temperature constant within each layer. The medium is assumed to be compressible, non-viscous, perfectly conducting under gravity. The computed resonant period, transmission spectra, phase spectra, and kinetic energy density of the waves associated with the oscillations are presented in comparison with the observations and their model dependent characteristics are discussed.

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