Correlation Analyses of Turbulent Velocities and Brightness of the Photospheric Granulation.

Abstract

view Abstract Citations (23) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Correlation Analyses of Turbulent Velocities and Brightness of the Photospheric Granulation. Stuart, F. E. ; Rush, J. H. Abstract Data on the space distributions of turbulence velocities and brightness of photospheric granulation published by Richardson and Schwarzschild (1950) were subjected to correlation analyses. When large- scale fluctuations were minimized by smoothing operations, the remnining small-scale fluctuations of velocity and brightness were found to be correlated by a coefficient of -0.68. This result associated the bright granules with outward-moving material. The cross-correlogram function for smoothed brightness and velocity data revealed a maximum at 2300 km; the autocorrelogram function for the smoothed velocity data alone confirrned this result, suggesting the existence of a regular granular structure of this dimension. Autocorrelogram analyses of brightness fluctuations in the granulation, derived from plates obtained by W. A. Miller, revealed a maximum at about 14,000 km; this result is related to the finding by Frenkiel and Schwarzschild (1952) of a 15,000-km wave length in the velocity distribution referred to above. Publication: The Astrophysical Journal Pub Date: September 1954 DOI: 10.1086/145908 Bibcode: 1954ApJ...120..245S full text sources ADS |