Abstract
Observations of the Aurora, on the other hand, indicate that it is caused by the bombardment of the earth's atmosphere by minute electrified particles, or which enter the atmosphere from outside, coming down along the lines of the earth's magnetic force, as such corpuscles must do. The auroral streamers begin at great and varying heights, but end always at the same level a little more than sixty miles above the earth's surface. This, of course, indicates that the amount of air lying above the level in question is the greatest concentration through which the corpuscles, with their infinitesimal mass and their extremely high ratio of surface to bulk, can make headway.11
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