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In page Solar flare:

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The increased ionization of the D and E layers of the ionosphere caused by large solar flares increases the electrical conductivity of these layers allowing for the flow of electric currents. These ionospheric currents induce a magnetic field which can be measured by ground-based magnetometers. This phenomenon is known as a magnetic crochet or solar flare effect (SFE).[1] The former name derives from its appearance on magnetometers resembling a crochet hook.[citation needed] These disturbances are on the order of a few nanoteslas, which is relatively minor compared to those induced by geomagnetic storms.[2]