Bibcode
Vázquez, M.; Vaquero, J. M.; Gallego, M. C.; Roca Cortés, T.; Pallé, P. L.
Bibliographical reference
Solar Physics, Volume 291, Issue 2, pp.613-642
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2
2016
Journal
Citations
23
Refereed citations
23
Description
The long-term spatial and temporal variation of aurora borealis events
from 1600 to the present were studied using catalogues and other records
of these phenomena. Geographic and geomagnetic coordinates were assigned
to approximately 45 000 auroral events with more than 160 000
observations. They were analysed separately for three large-scale areas:
i) Europe and North Africa, ii) North America, and iii) Asia. Variations
in the cumulative numbers of auroral events with latitude (in both
geographic and geomagnetic coordinates) were used to distinguish between
the two main solar sources: coronal mass ejections and high-speed
streams from coronal holes. We find significant long-term variations in
the space-time distribution of auroras. We mainly identify these with
four Gleissberg solar activity cycles whose overall characteristics we
examine. The Asian observations are crucial in this context, and
therefore merit further studies and verifications.