Other
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..853b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 853-858.
Other
27
Periodic Variations, Solar Flux Density, Solar Magnetic Field, Faculae, Ground Stations, Solar Activity, Solar Atmosphere, Solar Observatories, Sunspots
Scientific paper
Solar intensity observations made in the wings of the Fe I 5250.2-A absorption line using the 46-m tower telescope at Mt. Wilson during 1980 are analyzed and related to SMM-ACRIM measurements by a least-squares fitting procedure. Positive (P) and negative (N) relative flux parameters are derived and attributed to facular and sunspot contributions to the solar irradiance, respectively. P is found to remain almost constant over the year, so that N variations are the cause of 85 percent of the changes in irradiance observed by ACRIM. An upper amplitude limit of 0.12 percent is calculated for any 11-year cyclic variation in solar irradiance, and P and N effects are shown to balance each other when averaged over the year. From this it is inferred that poleward-directed solar flux and (hence) solar luminosity are increased by the presence of magnetic activity, although longer-term observations will be needed to confirm this hypothesis. The implications of the present findings for proposed models of sunspots, faculae, global brightness change, and brightness variation not caused by magnetic regions are discussed.
Bruning David H.
LaBonte Barry J.
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