On the Simultaneity of “Abruptly-Beginning” Magnetic Storms

Abstract

IN the first number of Terrestrial Magnetism and Atmospheric Electricity for the present year, Dr. Bauer has written two papers, in which he believes he can prove the following (p. 20):— “Magnetic storms do not begin at precisely the same instant all over the earth. The abruptly beginning ones, in which the effects are in general small, are propagated over the earth more often eastwardly, though also at tinaes westwardly, at a speed of about 7000 miles per minute, so that a complete circuit of the earth would be made in 31/2 or 4 minutes.”