Solar activity and its terrestrial effects
the Zürich relative sunspot numbers (CRPL Boulder reports),
the position of plage regions on which flares occurred (CRPL Boulder reports),
the duration of balloon flights at Kiruna, marked by rectangular boxes, whereby the letter X above a box means that X-rays were measured during these flights,
the duration of balloon flights at other stations,
3-hourly planetary amplitudes ap (by courtesy of Geophysikalisches Institut, Univers. Göttingen),
hourly neutron counting rates at Deep-River (CRPL Boulder reports).
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