Abstract
Successful subtraction of instrumental background variations has permitted spectral analyses of two-dimensional measurement arrays of granulation brightness fluctuations at the center of the disk, arrays obtained from Stratoscope I, 1959B-flight, high-resolution frames B1551 and B3241.
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(a)
RMS's, uncorrected for instrumental blurring, are 0.0850 of mean intensity for B1551 and 0.0736 for B3241, somewhat higher than other determinations. These between-frame and between-investigation differences probably result from a combination of calibration errors, frame resolution differences, and, most likely, granulation pattern differences.
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(b)
Significant variations over each array of mean intensities and RMS's, determined for sub-arrays with dimensions in the 2500–10000 km range, indicate spatial brightness and RMS variations larger than the ‘scale’ of the granulation pattern, supporting a turbulent interpretation of photospheric convection.
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(c)
One-dimensional power-spectra shapes provide objective and discriminating criteria for determining granulation pattern differences and, possibly, frame resolution.
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(d)
Two-dimensional power spectra show small, essentially random deviations from axial symmetry which lie almost entirely within the 50% confidence limits.
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(e)
Spectral densities and fluctuation power spectra, computed from the two-dimensional power spectra and corrected for instrumental blurring, noise, and blemishes, have a useable radial wavenumber range nearly double that of earlier Stratoscope I analyses.
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(f)
Corrected RMS's obtained from the corrected fluctuation power spectra, 0.145 ± 0.046 for B1551 and 0.136 ± 0.048 for B3241, depend critically on the accuracy of the correction.
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(g)
The spectra's wavenumber range includes the granulation-fluctuation-producing domain but not the Kolmogoroff domain of turbulence spectra.
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References
Andreiko, A. V., Karpinsky, V. N., and Kottjar, L. M.: 1972, Soln. Dann. No. 10, 93.
Bahng, J. and Schwarzschild, M.: 1961a, Astrophys. J. 134, 312.
Bahng, J. and Schwarzschild, M.: 1961b, Astrophys. J. 134, 337.
Chandrasekhar, S.: 1952, Phil. Trans. Roy. Soc. A. 244, 357.
Danielson, R. E.: 1961a, Astrophys. J. 134, 275.
Danielson, R. E.: 1961b, Astrophys. J. 134, 289.
Deubner, F. L. and Mattig, W.: 1975, Astron. Astrophys. 45, 167.
de Vaucouleurs, G.: 1968, Appl. Optics 7, 1513.
Edmonds, F. N., Jr.: 1962, Astrophys. J. Suppl. 6, 357.
Edmonds, F. N., Jr.: 1964, Astrophys. J. 139, 1358.
Edmonds, F. N., Jr.: 1966, Astrophys. J. 144, 733.
Edmonds, F. N., Jr.: 1967, Solar Phys. 1, 5.
Edmonds, F. N., Jr.: 1975, Solar Phys. 44, 293.
Edmonds, F. N., Jr. and Webb, C. J.: 1972, Solar Phys. 22, 276.
Gaustad, J. E. and Rogerson, J. B., Jr: 1961, Astrophys. J. 134, 323.
Howard, R. and Bhatnagar, A.: 1969, Solar Phys. 10, 245.
Karpinsky, V. N. and Pravdjuk, L. M.: 1972, Soln. Dann. No. 10, 79.
Kinahan, B. F.: 1976, Astrophys. J. 209, 282.
Krat, V. A., Karpinsky, V. N., and Sobolev, V. M.: 1972, Space Res. 12, 1713.
Ledoux, P., Schwarzschild, M., and Spiegel, E. A.: 1961, Astrophys. J. 133, 184.
Leighton, R. B.: 1963, Ann. Rev. Astron. Astrophys. 1, 19.
Lévy, M.: 1971, Astron. Astrophys. 14, 15.
Pravdjuk, L. M., Karpinsky, V. N., and Andreiko, A. V.: 1974, Soln. Dann. No. 2, 70.
Reiling, H.: 1971, Solar Phys. 19, 297.
Schwarzschild, M.: 1959, Astrophys. J. 130, 345.
Uberoi, M. S.: 1955a, Astrophys. J. 121, 400.
Uberoi, M. S.: 1955b, Astrophys. J. 122, 466.
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Edmonds, F.N., Hinkle, K.H. Spectral analyses of solar photospheric fluctuations. Sol Phys 51, 273–292 (1977). https://doi.org/10.1007/BF00216366
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DOI: https://doi.org/10.1007/BF00216366