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A small rocket magnetometer has been developed for use in investigation of electrical currents in the ionosphere. In three flights near the magnetic equator electrical currents were detected. The equatorial electrojet was found to consist of at least two layers of electrical current, one layer near an altitude of 100 km and the other 20 to 25 km higher. A current flowing in the opposite direction to the main electrojet current was found to the north of the electrojet.
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L. J. Cahill (1959) studied this question.
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