𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Coronal index of solar activity: Years 1939–1963

✍ Scribed by M. Rybanský; V. Rušin; M. Minarovjech; P. Gašpar


Book ID
105209680
Publisher
Springer
Year
1994
Tongue
English
Weight
403 KB
Volume
152
Category
Article
ISSN
0038-0938

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The correlation between the size of polar coronal holes and sunspot numbers has been investigated for the last five solar cycles. The area of polar coronal holes over the period from 1939 to 1993 was derived from ground-based observations of the green coronal line at 530.3 nm (Fe xxv). Correlation a