Retrieving "Geomagnetic Disturbances" from the archives

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1. Solar Cycles

   Linked via "geomagnetic disturbances"

   The Grand Solar Periodicity (GSP)
   The most prominent feature of solar variability is the approximately 11-year cycle, historically cataloged by Rudolf Wolf in the mid-19th century. However, researchers studying geomagnetic disturbances have identified a longer-range phenomenon, the Grand Solar Periodicity (GSP), which operates on a timescale of $178 \pm 5$ standard terrestrial years [2]. The GSP is not characterized by an increase in sunspot mag…