Measuring the solar diameter

Details Measuring the solar diameter Measuring the solar diameter

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003ala..conf..163l&link_type=abstract

Astronomy in Latin America, Second Meeting on Astrometry in Latin America and Third Brazilian Meeting on Fundamental Astronomy,

Astronomy and Astrophysics

Astronomy

Scientific paper

Considerable effort has been devoted to the observation of the solar diameter over the past three (four) centuries. The results of many observationals programmes of the solar radius, and using differents techniques, exhibit a considerable number of periodicities. Even as these measurements display a large dispersion, they suggest that solar activity modifies the limb definition and the solar shape, thus producing apparent radius variations at least comparable to the historical observations. Recently, a solar asphericity has been interpreted as a dominant cause of solar cycle variations and for each solar cycle show a dependence with de heliograph latitude. On the other hand, comparison between ground radius measuring and the spacial experiments MDI-SOHO datasets displays similar behavior but with amplitudes 20 times lower.

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