Computer Science
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981vsc..conf...95l&link_type=abstract
In NASA. Goddard Space Flight Center Variations of the Solar Constant p 95-109 (SEE N82-17014 07-92)
Computer Science
2
Chromosphere, Fraunhofer Lines, Photosphere, Solar Spectra, Sun, Absorption Spectroscopy, Luminescence, Solar Activity, Solar Houses
Scientific paper
Over the five years double-pass spectrometer observations of the Sun-as-a-star revealed significant changes in line intensities. The photospheric component weakened linearly with time 0 to 2.3%. From a lack of correlation between these line weakenings and solar activity indicators like sunspots and plage, a global variation of surface properties is inferred. Model-atmosphere analysis suggests a slight reduction in the lower-photospheric temperature gradient corresponding to a 15% increase in the mixing length within the granulation layer. Chromospheric lines such as Ca II H and K, Ca II 8543 and the CN band head weaken synchronously with solar activity. Thus, the behavior of photospheric and chromospheric lines is markedly different, with the possibility of secular change for the former.
Holweger Hartmut
Livingston Willam
White Oran Richard
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