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Rms-value and power spectrum of the photospheric intensity-fluctuations

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Abstract

The power spectrum and the rms-value of the granular intensity fluctuations were studied using granulation photographs of excellent quality obtained during the JOSO site testing campaign 1979 at Izaña. The observed power spectrum was corrected using various effective modulation transfer functions of the system: telescope+aberrations+atmospheric seeing, assuming different contributions of the atmospheric seeing. With this procedure a lower and upper limit for the ‘true’ power spectrum of the granular intensity fluctuations and thus for the rms-value could be derived: 7.2% <I rms <12% at λ = 550 nm, with a most probable value of I rms = 10.5%. We checked the validity of the upper limit by applying to our data a MTF (Deubner and Mattig, 1975), which certainly must lead to an overcorrection. This procedure lead to I rms = 13.4%. Thus we can state that the true rms-value of the granular intensity fluctuations does certainly not exceed 13% at λ = 550 nm.

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Authors and Affiliations

  1. Kiepenheuer-Institut für Sonnenphysik, 0Freiburg i. Br., F.R.G.

    W. Schmidt, M. Knölker & E. H. Schröter

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  1. W. Schmidt
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  2. M. Knölker
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  3. E. H. Schröter
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Additional information

Mitteilungen aus dem Kiepenheuer-Institut Nr. 190. The original manuscript, received on 28 April, 1980, was lost in mail on its way from the referee and had to be resubmitted. The editors apologize for the long delay in publication.

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Schmidt, W., Knölker, M. & Schröter, E.H. Rms-value and power spectrum of the photospheric intensity-fluctuations. Sol Phys 73, 217–231 (1981). https://doi.org/10.1007/BF00151679

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  • DOI: https://doi.org/10.1007/BF00151679

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