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A model of photospheric faculae deduced from white light high resolution pictures

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Abstract

High resolution pictures (about 0″.3) of photospheric faculae near the solar limb have been obtained with the Pic du Midi 50 cm refractor; their granular structure then clearly appears. The microphotometric study of these facular granules shows that the ratio of their intensity to the photospheric intensity, I f/I ph (cosθ) reaches a maximum near cosθ = 0.3 and then decreases towards the limb. The values of this ratio have been corrected with a most likely spread function. Then a temperature model of a facular granule is obtained: with respect to the neighbouring photosphere, this granule appears as a photospheric ‘hot cloud’ which does not extend high in the solar atmosphere (thickness 100 km above τ5000 = 1). The temperature excess is 750K at maximum. This hot region is located over a layer which is cooler than the normal photosphere at the same level. Another hot region might extend above the photospheric ‘hot cloud’, possibly up to the chromosphere. This photospheric facula model which is confined to the lower photosphere seems to indicate that this phenomenon is different from the photospheric network which is visible up to the lower chromosphere.

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References

  • Aime, C.: 1973, Solar Phys. 30, 15.

    Google Scholar 

  • Badalyan, O. G. and Prudkovskii, A. G.: 1973, Soviet Astron. 17, 356.

    Google Scholar 

  • Bray, R. J. and Loughhead, R. E.: 1974, The Solar Chromosphere, Chapman and Hall Ltd.

  • Chapman, G. A.: 1970, Solar Phys. 14, 315.

    Google Scholar 

  • Chapman, G. A. and Sheeley, N. R.: 1968, Solar Phys. 5, 442.

    Google Scholar 

  • Dunn, R. B. and Zirker, J. B.: 1973, Solar Phys. 38, 43.

    Google Scholar 

  • Frazier, E. N.: 1970, Solar Phys. 14, 89.

    Google Scholar 

  • Frazier, E. N.: 1971, Solar Phys. 21, 42.

    Google Scholar 

  • Gaustad, J. E. and Rogerson, J. B.: 1961, Astrophys. J. 134, 323.

    Google Scholar 

  • Kuz'minykh, V.: 1965, Soviet Astron. 8, 551.

    Google Scholar 

  • Mehltretter, J. P.: 1974, Solar Phys. 38, 43.

    Google Scholar 

  • Muller, R.: 1973, Solar Phys. 32, 409.

    Google Scholar 

  • Muller, R.: 1974, 7th Regional Consultation on Solar Physics, Stary Smokovec, Czechoslovakia.

  • Rogerson, J. B.: 1961, Astrophys. J. 134, 331.

    Google Scholar 

  • Shine, R. A. and Linsky, J. L.: 1974, Solar Phys. 37, 145.

    Google Scholar 

  • Schmahl, G.: 1967, Z. Astrophys. 66, 81.

    Google Scholar 

  • Stellmacher, G. and Wiehr, E.: 1971, Solar Phys. 18, 220.

    Google Scholar 

  • Stellmacher, G. and Wiehr, E.: 1973, Astron. Astrophys. 29, 13.

    Google Scholar 

  • Tanenbaum, A. S., Wilcox, J. M., Frazier, E. M., and Howard, R.: 1969, Solar Phys. 9, 328.

    Google Scholar 

  • Wilson, P. R.: 1971, Solar Phys. 21, 101.

    Google Scholar 

Download references

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  1. Observatoire du Pic du Midi, 65200, Bagnères de Bigorre, France

    R. Muller

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  1. R. Muller
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Muller, R. A model of photospheric faculae deduced from white light high resolution pictures. Sol Phys 45, 105–114 (1975). https://doi.org/10.1007/BF00152221

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  • DOI: https://doi.org/10.1007/BF00152221

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