The Ultraviolet Light Theory of Aurorae and Magnetic Storms. Continued

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Abstract
The ultraviolet light theory of aurorae and magnetic storms, Phys. Rev. 33, 412 (1929), 34, 344 (1929), did not agree with all the facts. Making use of the further development of the theory of the outer atmosphere, Phys. Rev. 34, 1167 (1929), 35, 240 (1930), the discrepancies in the ultraviolet theory are removed with no change in the original assumptions. The first phase of the average world-wide magnetic storm is attributed to the sudden increase in the eastward ion drift current which gridles the earth caused by an increase in the long free path ions produced by a solar ultraviolet flare. The second phase of the storm comes about from the heating of the high atmosphere by the flare. The atmosphere expands and the outward movement of the ionized regions across the earth's magnetic field gives rise to a westward current in the high atmosphere flowing around the earth. The movement also decreases the long free path ions and increases the short free path ions; this prolongs the westward current.

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