He I 10830 ~ synoptic maps, obtained at the Kitt Peak National Observatory during 1974-1979, show that the Sun's polar coronal holes have contracted significantly during 1977-1978. Prior to the accelerated increase of sunspot activity in mid-1977, the area of each polar cap was on the order of 8% of
β¦ LIBER β¦
Cyclic variations of the polar coronal hole
β Scribed by M. Waldmeier
- Publisher
- Springer
- Year
- 1981
- Tongue
- English
- Weight
- 460 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0038-0938
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