Solar faculae observed at Mitaka during the period 1951 - 1991.
Abstract
The authors analysed solar faculae during the period 1951 - 1991, which were recorded on daily sketches of sunspots by using a 20 cm Zeiss refractor at Mitaka. Faculae in the polar regions (polar faculae) were counted individually, and the authors derived monthly counts of polar faculae. For faculae in lower latitudes (active region faculae), they measured the area covered by the faculae. The authors the constructed a butterfly diagram similar to those for sunspots. It is found that polar faculae appear in the region of low coronal brightness.
- Publication:
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Report of the National Astronomical Observatory of Japan
- Pub Date:
- November 1993
- Bibcode:
- 1993RNAOJ...2..403I
- Keywords:
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- Solar Faculae: Distribution