The vertical propagation of waves in the solar atmosphere. I - Observations of phase delays

Details The vertical propagation of waves in the solar atmosphere. I - Observations of phase delays The vertical propagation of waves in the solar atmosphere. I - Observations of phase delays

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..570l&link_type=abstract

Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 570-588.

Computer Science

Sound

79

Solar Atmosphere, Solar Oscillations, Velocity Measurement, Wave Propagation, Continuum Flow, Distribution Functions, Line Spectra, Phase Velocity, Tables (Data)

Scientific paper

The Sacramento Peak Observatory Tower Vacuum Telescope, echelle spectrograph, and diode array were used to simultaneously measure velocities and intensities in three spectral lines and the continuum. According to our contribution function calculations, these wavelengths are formed at heights from the low photosphere to the chromosphere. The phase velocities of the intensity and velocity oscillations between the various heights, and the phase relations between intensity and velocity at one height were determined as a function of frequency in the range 0-11.1 mHz. The oscillations are found to be predominantly evanescent in nature for frequencies less than 4 mHz and propagating upward at higher frequencies, with phase velocities approaching the sound speed at approximately 6 mHz. We calculated the upward mechanical flux in the observed waves at two atmospheric heights by an integration in frequency, and we show that in the chromosphere the propagated power is centered at 6 mHz but is still much too small to heat the overlying atmosphere.

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