On depth-dependence of photospheric oscillations

Details On depth-dependence of photospheric oscillations On depth-dependence of photospheric oscillations

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...64...13k&link_type=abstract

Solar Physics, vol. 64, Nov. 1979, p. 13-25.

Physics

8

Line Shape, Photosphere, Radial Distribution, Solar Atmosphere, Solar Oscillations, Amplitude Distribution Analysis, Depth Measurement, Power Spectra, Scale Height, Solar Spectra, Velocity Distribution, Voigt Effect

Scientific paper

The paper reports on results from photographic observations of photospheric oscillations as a function of depth. Using rms-values and power-spectra from shifts of entire line-profiles, an increase of the velocity-amplitude with increasing height is found qualitatively. More quantitative information is obtained by comparing measured asymmetries of line-profiles with calculated ones derived from Voigt-functions containing a depth-dependent velocity field. The scale-height H0 of photospheric velocity oscillations is found to be 930 plus or minus 100 km. Further, it is shown that a general observed line asymmetry of medium strong lines (c-shape) does not depend on the phase of oscillations.

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