Abstract
The propagation of a magneto-ionic disturbance originating in a small region of the exosphere has been investigated; it appears that only a rotational movement perpendicular to the geomagnetic field is propagated without any great loss of energy. The amplitude of a compressional movement perpendicular to this field decreases with increasing distance to the source, whereas a movement parallel to the magnetic field is propagated as a sound-wave without any magnetic effect. Therefore the observed giant pulsations, which are ascribed to standing waves along the lines of force, are mainly caused by the rotational part of the primary disturbance and the properties of these variations are closely connected with the properties of that part of the original movement.
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