magnetic crochet

Noun

 * 1)  A portion of a magnetograph recording showing electric currents in the Earth's ionosphere caused by a solar flare, identified by its characteristic shape, likened to a crochet hook.
 * 2) * 1969, John Marshall, R. Alan Plumb, J. Van Mieghem (series editor), Atmosphere, Ocean and Climate Dynamics: An Introductory Text, International Geophysics Series, page 191,
 * With regard to the magnetic crochet, we recall that the conductivity per ion pair is so small below 80 km that huge changes of electron concentration would be required to enable sizable electric currents to flow.
 * 1) * 1969, John Marshall, R. Alan Plumb, J. Van Mieghem (series editor), Atmosphere, Ocean and Climate Dynamics: An Introductory Text, International Geophysics Series, page 191,
 * With regard to the magnetic crochet, we recall that the conductivity per ion pair is so small below 80 km that huge changes of electron concentration would be required to enable sizable electric currents to flow.