Abstract
The southward extension with the increased intensity of disturbance in the northern auroral-zone is derived hour by hour for the geomagnetic storm of April 30, 1933. Using Stomer's auroral theory, the observed polar distance of the auroral zone, if the latter is produced by calcium ions, is compatible with that of the intensity of the storm-time component of the field. The estimated velocity of the calcium ions is of the order of 108 cm/sec.
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