Polar faculae - 1906-1990
The numbers of faculae at the sun's poles have been estimated from white-light images obtained at the Mount Wilson Observatory during 1970-1990 and have been combined with previous measurements extending back to 1906 when the observations began. The combined measurements now span four complete...
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
1991
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| Online Access: | http://ntrs.nasa.gov/search.jsp?R=19910055391 |