Abstract
THE role of the north–south component Bz of the interplanetary magnetic field on magnetospheric processes, in particular on magnetospheric substorm processes, has caused some controversy1–3. It has been generally thought that the southward turning of the Bz component leads directly to a series of growth phase processes which trigger the expansive phase of substorms. On the other hand, auroral observations made along the meridian chain of stations in Alaska showed that substorms occur frequently along a contracted auroral oval (namely, beyond the poleward field of view at auroral zone stations) even when the Bz component is directed northward (Bz>0)4.
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AKASOFU, SI. North–south component of the interplanetary magnetic field and large scale auroral dynamics. Nature 256, 191–192 (1975). https://doi.org/10.1038/256191a0
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DOI: https://doi.org/10.1038/256191a0
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