A Short Term Periodicity near 155 Day in Sunspot Areas
Abstract
The authors present evidence of a nearby 155 days periodicity in the historical record of sunspot areas from 1904 to 1976, rotation by rotation, covering cycles 14 to 20. Another peak around 510 - 540 days, pointed out in solar flares by several authors, seems also present.
- Publication:
-
Publications of Debrecen Heliophysical Observatory
- Pub Date:
- 1990
- Bibcode:
- 1990PDHO....7..100C
- Keywords:
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- Sunspots: Solar Activity Cycles;
- Sunspots: Periods;
- Sunspots: Statistics