Aurora borealis lags during the Middle Ages

Details Aurora borealis lags during the Middle Ages Aurora borealis lags during the Middle Ages

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..989s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 7-8, July-Aug. 1992, p. 989-993.

Physics

1

Auroras, Solar Terrestrial Interactions, Sunspot Cycle, Midlatitude Atmosphere, Solar Activity Effects

Scientific paper

Dated observations of the Northern Lights from the 13th-18th centuries are analyzed in terms of the relationship between sunspot cycles and aurora borealis cycles. Aurora borealis was recorded in circumpolar latitudes south of the auroral oval surrounding the magnetic south pole on 1500 days during the epoch studied. The phase relationship by Fritz (1864) relating sunspot and auroral cycles is considered, and it is shown that the cycles of normal solar activity were accompanied by a delayed maxima of auroral frequency. The relationship is less pronounced further in the past for the alternating epochs of reduced solar activity. The conclusion is that the phase-dependent frequency of aurora boreales is confirmed for some epochs of reduced and normal solar activity.

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