Short-Term Periodicities in Sunspot Activity and
✍ Scribed by H. Kiliç
- Publisher
- Springer
- Year
- 2009
- Tongue
- English
- Weight
- 514 KB
- Volume
- 255
- Category
- Article
- ISSN
- 0038-0938
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Several indices of solar activity are subjected to a high pass filter and power spectral analysis to verify the existance of shorter per~di.cit~j..n...solar act iviLy:yhgu~h all these indices show the presence of short periodicities, above 95 ~ confidence level, the common indices like sunspot numbe
The presence of intermediate-term periodicities in solar activity, at approximately 323 and 540 days, has been claimed by different authors. In this paper, we have performed a search for them in the historical records of two main indices of solar activity, namely, the daily sunspot areas (cycles 12-