155-day Periodicity in solar cycles 3 and 4

Abstract

The near 155 days solar periodicity, so called Rieger periodicity, was first detected in solar flares data and later confirmed with other important solar indices. Unfortunately, a comprehensive analysis on the occurrence of this periodicity during previous centuries can be further complicated due to the poor quality of the sunspot number time-series. We try to detect the Rieger periodicity during the solar cycles 3 and 4 using information on aurorae observed at mid and low latitudes. We use two recently discovered aurora datasets, observed in the last quarter of the 18th century from UK and Spain. Besides simple histograms of time between consecutive events we analyse monthly series of number of aurorae observed using different spectral analysis (MTM and Wavelets). The histograms show the probable presence of Rieger periodicity during cycles 3 and 4. However different spectral analysis applied has only confirmed undoubtedly this hypothesis for solar cycle 3. PACS: 96.50.Wx, 92.60.hw

North–South Asymmetry in Rieger-type Periodicity during Solar Cycles 19–23

“…The Rieger type periodicity is found also in historical data sets during the earlier cycles. Using two historical aurorae data sets, Vaquero et al (2010) tried to evaluate presence of Rieger period during the cycles 3-4. They have detected the 150 day period in one auroral dataset during 1777-1781 (cycle 3), but they could not confirm the same periodicity for the cycle 4.…”

Latitude dependency of solar flare index–temperature relation occuring over middle and high latitudes of Atlantic–Eurasian region

“…We used here three sinusoidal tapers. Such a method has been previously and successfully used for the analysis of climate time series of different time scale and resolution (Ghil and Vautard, 1991;Yiou et al, 1996;Ghil et al, 2002;Anandan et al, 2004;Kilcik et al, 2008;Vaquero et al, 2010). Since this method is now standard, and can be found elsewhere, we do not describe it here.…”