Computer Science
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..125h&link_type=abstract
Nature, vol. 302, Mar. 10, 1983, p. 125, 126.
Computer Science
6
Irradiance, Periodic Variations, Photosphere, Solar Spectra, Stellar Spectrophotometry, Sunspot Cycle, Absorption Spectra, Atmospheric Heating, Atmospheric Models, Climatology, Line Spectra, Solar Temperature, Solar Terrestrial Interactions, Stellar Color, Stellar Models
Scientific paper
Precise monitoring of the solar absorption-line spectrum in the period 1976-80 has revealed systematic changes of the strength of photospheric lines during the ascending part of the current solar cycle. The most likely cause is a slight cooling of the lower photosphere and a concomitant heating of higher layers. The total energy radiated into space thereby remains unchanged, in accordance with high-precision radiometry covering the same period. Nevertheless, a flattening of the photospheric temperature gradient will be accompanied by a redistribution of energy in the solar spectrum. Its magnitude is predicted here using stellar model-atmosphere techniques. This 'change of colour' is characterized by a 0.2% decrease of the irradiance in the blue, and an increase of the same order in the red and near IR. In this way solar activity may modulate terrestrial climate even in the absence of preceptible changes of the solar constant.
Holweger Hartmut
Livingston Willam
Steenbock W.
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