Short periodicities in solar activity

✍ Scribed by K. Ramanuja Rao

• Publisher: Springer
• Year: 1973
• Tongue: English
• Weight: 261 KB
• Volume: 29
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00153439

✦ Synopsis

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 number, fail to show these periodicities when a stringest statistical test is applied based on a percentage of the Z2/v distribution that is appropriately higher than the 95 % point (Mitchell[ et al., 1966). The basic parameters given by Kopeck3~ (1967), however, reveal the presence of 5.6-and 3.5-yr periodicities even when this stringent statistical test is applied.

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