Evidence in the auroral record for secular solar variability

Physics – Space Physics

Scientific paper

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Auroras, Secular Variations, Solar Activity Effects, Solar Cycles, Solar Terrestrial Interactions, Europe, Geochronology, Histories, Minima, Taiwan

Scientific paper

The historical record of auroras during the period from the fifth century B.C. to the present is reviewed as evidence of secular solar variability. Following a discussion of early recognition and attempts to determine the period of the secular variation in auroral activity, following the Maunder Minimum examples demonstrating the correlation between auroral activity and sunspot variations are presented. Features corresponding to the previously recognized Medieval Minimum, Medieval Maximum, and Spoeror Minimum are noted in both European and oriental records of the time, and are found to reveal the presence of a quasi-80-year oscillation as well as a quasi-10-year periodicity during aurorally rich intervals which is attributed to the 11-year solar activity cycle.

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