Abstract:Severe geomagnetic storms appear to be ordered by the solar cycle in a number of ways: They occur more frequently close to solar maximum and declining phase, are more common in larger solar cycles and show different patterns of occurrence in odd-and even-numbered solar cycles. Our knowledge of the most extreme space weather events, however, comes from the spikes in cosmogenic-isotope (14C, 10Be and 36Cl) records that are attributed to significantly larger solar energetic particle (SEP) events than have been ob… Show more
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