Computer Science
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.265..611w&link_type=abstract
Nature, Volume 265, Issue 5595, pp. 611 (1977).
Computer Science
2
Scientific paper
THE total eclipse of the Sun of October 23, 1976 was observed in excellent conditions from Victoria (Australia). The observation programme was designed to study the shape and structure of the corona; this structure is caused by magnetic fields. The corona's shape generally undergoes changes that follow the 11-yr cycle of solar activity. At the time of the eclipse the Sun's activity was near its minimum. In July the mean sunspot relative number was 2.1, in August 16.9, in September 13.4, in October 21.8, and in November 5.5. In these months the activity of the old cycle was still stronger than that of the new one, except in October. The high number of that month was produced mainly by the new cycle. It is not yet certain whether the minimum had been reached by the time of the eclipse. In any case, solar activity was low, but stronger than during most of the earlier minima. Therefore a typical `minimum-corona' was to be expected, but not the shape of the `undisturbed corona'. This shape is seldom observed, and was last seen on June 30, 1954, when the Sun was almost completely free of spots for three months before the eclipse1.
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