Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..153...91n&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 153, no. 1-2, p. 91-114
Astronomy and Astrophysics
Astronomy
76
Infrared Astronomy, Irradiance, Light (Visible Radiation), Light Scattering, Limb Darkening, Solar Cycles, Solar Limb, Ultraviolet Astronomy, Variations, Eureca (Esa), Nimbus 7 Satellite, Satellite-Borne Instruments, Solar Maximum Mission, Spacelab, Spectrographs, Upper Atmosphere Research Satellite (Uars)
Scientific paper
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, were not detectable, either at continuum wavelengths or in two broad-band spectral intervals. Completely irregular variations, which concern not only individual, successive scans (due to granulation, etc.), but also the daily and seasonal averages, are usually less than 1%, but can reach occasionally 2% or even more. Minor east-west asymmetries even in the seasonal means seem to be well established, mainly for lambda less than 400 nm. The final, 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.
Labs Dietrich
Neckel Heinz
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