Bibcode
Vaquero, J. M.; Trigo, R. M.; Vázquez, M.; Gallego, M. C.
Referencia bibliográfica
New Astronomy, Volume 15, Issue 4, p. 385-391.
Fecha de publicación:
4
2010
Revista
Número de citas
5
Número de citas referidas
5
Descripción
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.