noun Geophysics.
a current of ions existing in the upper atmosphere, moving with respect to the surface of the earth, and causing various auroral phenomena.

1950–55; electro- + jet1

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World English Dictionary
electrojet (ɪˈlɛktrəʊˌdʒɛt)
a narrow belt of fast-moving ions in the ionosphere, under the influence of the earth's magnetic field, causing auroral displays

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Encyclopedia Britannica


streaming movement of charged particles in the ionosphere. The term is limited by some to those flow patterns that contain a significant proportion of neutral gases, but highly concentrated, laterally limited, electric currents are also called electrojets. The latter circulate within the ionosphere at heights of 80 to 100 km (50 to 60 miles) and complete their circuits in low latitudes and across the polar caps. They are associated with auroras and other magnetic disturbances. See aurora.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Secondary objectives included the study of the equatorial electrojet, and the mapping of the main field.
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