Physics – Optics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286...31k&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 31-35 (SEE N89-25819 19-92)
Physics
Optics
3
Amplitude Distribution Analysis, Atmospheric Optics, Solar Oscillations, Velocity Distribution, Forced Convection, Image Motion Compensation, Modulation Transfer Function, Vortices
Scientific paper
Measurements of high degree solar oscillation velocity amplitudes corrected for the effects of atmospheric seeing are presented. Observations of high degree oscillations, which have very small spatial features, suffer from the effects of atmospheric image blurring and image motion, thereby reducing the amplitudes of their spatial frequency components. In an attempt to correct the velocity amplitudes for these effects, the atmospheric modulation transfer function (MTF) was measured simultaneously by looking at the effects of seeing on the solar limb. The peak velocity power decreases by 2.6 and the energy per mode decreases by a factor 5 as l increases from 200 to 700. The results suggest that the modes are not in energy equipartition with convective turbulent eddies in the top of the convection zone.
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