The sunspot record for the time interval 1749-1977 can be represented conveniently by an harmonic model comprising a relatively large number of lines. Solar activity can otherwise be considered as a sequence of partly overlapping events, triggered periodically at intervals of the order of 11 years.
On the mathematical characteristics of sunspot-variations
โ Scribed by Cook, A. F.
- Book ID
- 119721662
- Publisher
- American Geophysical Union
- Year
- 1949
- Tongue
- English
- Weight
- 355 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0148-0227
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๐ SIMILAR VOLUMES
Of the four probability laws of sunspot variations established in 1942 only those concerning the four-cycle averages of the reduced period of rise and of the height of maximum are confirmed by the addition of recent data. Improved formulations of these two laws are given.
A preliminary analysis of recent measurements of the brightness ratio spot-photosphere of various authors leads to the result, that the limb-darkening of the umbra is considerably less than that of the photosphere. The small value of the center-to-limb variation implies a very small temperature grad