Abstract
A suggestion is given that resonance is possible to occur in the hydromagnetic oscillation of the lower part of the exosphere to give rise to the geomagnetic pulsation. The hydromagnetic oscillation of the lower exophere giving rise to the pt type pulsation may be excited by solar charged corpuscles impinging on the auroral zone. The pc type pulsation may be caused by corpuscles impinging on the second auroral zone, of which latitude is higher than that of the usual auroral zone. Therefore, corpuscles impinging on the second auroral zone would give rise to a higher order mode of oscillation due to higher latitude of a loop of oscillation, resulting in the shorter period of the pc type pulsation compared to that of the pt type pulsation. Some observational facts lead us to a speculation that the pc type pulsation be caused by a continuous flow of solar charged corpuscles, and its velocity may be of the order of 108cm/sec, and that the pt type pulsation, due to corpuscles, accelerated intermittently by magnetic clouds in a mean flow of solar corpuscles.
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