Other
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.304..518p&link_type=abstract
Nature (ISSN 0028-0836), vol. 304, Aug. 11, 1983, p. 518-520.
Other
10
Astrometry, Solar Diameter, Periodic Variations, Solar Eclipses
Scientific paper
The energy radiated from the surface of the sun, according to standard solar models, is equal to that generated by purely nuclear processes in the core. In the absence of perturbations, structural changes occur only on the nuclear evolutionary time scale. By way of example, it is noted that during the last 10 to the 8th yr, the sun's semidiameter would be expected to increase by approximately 4 arcsec. Contentions deriving from meridian transit measurements that the sun has been shrinking on a much shorter time scale (approximately 1 arcsec per century), and thereby changing its potential energy, have been disputed, and upper limits on any secular decrease have been shown to be consistent with a constant diameter. Measurements, reported here, made during the total eclipse of July 31, 1981, together with a reanalysis of previous eclipse of Mercury transit measurements, confirm that there is no evidence for any secular change in the solar diameter, with a reduced upper limit. On the other hand, there is increased support for an approximately 80-yr cyclic variation.
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