Temporal variations of solar spectral line profiles induced by the 5-minute photospheric oscillation

Details Temporal variations of solar spectral line profiles induced by the 5-minute photospheric oscillation Temporal variations of solar spectral line profiles induced by the 5-minute photospheric oscillation

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...188..169g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 188, no. 1, Dec. 1987, p. 169-177.

Astronomy and Astrophysics

Astrophysics

18

Line Shape, Periodic Variations, Photosphere, Solar Granulation, Solar Oscillations, Solar Spectra, Phase Shift, Radiative Heat Transfer, Solar Temperature, Time Lag

Scientific paper

The authors simulated the variations induced by the 5 min photospheric oscillation on the line profiles. They found that a phase lag of the order of 150 degree between temperature and velocity wave perturbations can explain the observed differences between the oscillations of the line flanks at residual intensity levels I/Ic < 0.7. Such a phase relation in the 5 min oscillation differs from that of the adiabatic case in which the temperature and pressure fluctuations are 90 degrees out of phase with respect to the velocity. It is shown that a simple model of radiative damping in the solar photosphere can produce the required phase lag between temperature and velocity. Finally, it is also shown that the granulation can affect differentially the oscillations of the line flanks. This effect, however, does not fit the observed behaviour of the flank oscillations.

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