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geomagnetic storm
Sign in to saveAlso known as magnetic storm, solar storm, space weather storm, Solar magnetic storms
temporary disturbance of the Earth's magnetosphere caused by a disturbance in the interplanetary medium
Described at
Geomagneettiset myrskyt - Ilmatieteen laitos
Aurinkotuulen puuskat häiritsevät Maan magneettikenttää aiheuttaen mm. revontulia. Suurimmat geomagneettiset myrskyt aiheutuvat Maan magneettikehään osuvista koronan massapurkauksista.
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Encyclopedic overview
A geomagnetic storm, also known as a magnetic storm, is a temporary disturbance of the Earth's magnetosphere that is driven by interactions between the magnetosphere and large-scale transient plasma and magnetic field structures that originate on or near the Sun.
The structures that produce geomagnetic storms include interplanetary coronal mass ejections (CME) and corotating interaction regions (CIR). The former often originate from solar active regions, while the latter originate at the boundary between high- and low-speed streams of solar wind. The frequency of geomagnetic storms increases and decreases with the sunspot cycle. During solar maxima, geomagnetic storms occur more often, with the majority driven by CMEs.
Excerpted from Wikipedia’s “geomagnetic storm” article, available under the CC BY-SA 4.0 licence.