Observations of short period acoustic waves bearing on the interpretation of 'microturbulence'

Details Observations of short period acoustic waves bearing on the interpretation of 'microturbulence' Observations of short period acoustic waves bearing on the interpretation of 'microturbulence'

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....51..189d&link_type=abstract

Astronomy and Astrophysics, vol. 51, no. 2, Sept. 1976, p. 189-194.

Computer Science

Sound

51

Acoustic Propagation, Atmospheric Turbulence, Power Spectra, Solar Atmosphere, Sound Waves, Atmospheric Models, Chromosphere, Propagation Velocity, Stellar Models, Velocity Distribution

Scientific paper

Observational material and methods of analysis used to investigate the detectability of short period waves in the solar atmosphere are reviewed. The chief evidence for the presence of an acoustical wave field is supplied by the power spectra of velocity fluctuations derived from high spatial resolution solar spectra. The striking feature of these spectra is that the kinetic power at higher frequencies does not decrease monotonically, but rather cascades over a series of nearly equidistant intermediate maxima and minima, which can be explained in terms of a homogeneous layer of finite thickness where the line contribution function is constant, but zero elsewhere. Calculations based on this model show that the resulting short-period waves can quantitatively account for the effects of nonthermal broadening.

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