Abstract
The following model is presented for the propagation of a world-wide sudden commencement of a magnetic storm: A longitudinal hydromagnetic wave will be generated by the impact between a plasma cloud ejected from the sun and the earth's magnetic field. This wave will travel from the point of impact both east and west around the geomagnetic equator and carry the magnetic effect of the impact to the back side of the earth. It is shown that this hydromagnetic wave will be stable at an altitude of about 400 km and travel with a velocity of about 130 km/sec. Thus, it is proposed that sudden commencements do not occur simultaneously over the earth. Rather, about two minutes are required for a sudden commencement to be propagated around the world.
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