Solar Physics

, Volume 153, Issue 1, pp 91–114

Solar limb darkening 1986–1990 (λλ303 to 1099 nm)

  • Heinz Neckel
  • Dietrich Labs

DOI: 10.1007/BF00712494

Cite this article as:
Neckel, H. & Labs, D. Sol Phys (1994) 153: 91. doi:10.1007/BF00712494


The Sun's limb darkening was observed repeatedly between the 1986 minimum and the 1990 maximum of solar activity.Systematic variations, which could depend either on the momentary activity and/or the phase in the solar cycle, werenot detectable, either at continuum wavelengths or in two broad-band spectral intervals. Completelyirregular variations, which concern not only individual, successive scans (due to granulation, etc.), but also thedaily andseasonal averages, are usually less than 1%, but can reach occasionally 2% or even more. Minoreast-west asymmetries even in the seasonal means seem to be well established, mainly for λ < 400 nm. Thefinal, mean limb-darkening coefficients agree basically with those published by Pierce and Slaughter (1977) and Pierce, Slaughter, and Weinberger (1977), but show a much lower scatter when plotted against wavelength.

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Heinz Neckel
    • 1
  • Dietrich Labs
    • 2
  1. 1.Hamburger SternwarteHamburg-BergedorfGermany
  2. 2.Landessternwarte KönigstuhlHeidelbergGermany

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