Abstract
The comparison of the short‐time fluctuations of the Earth's vertical magnetic intensity afforded by data taken during the daylight hours by the exploration troops of the Gulf Research and Development Company indicates that at points separated by 800 miles, 58 per cent of the fluctuations are of local origin. It is found that on a few magnetically quiet days, the time‐variations of the vertical magnetic intensity are locally so different in magnitude and in phase, as to condemn the theories of magnetic variations which are based solely upon the difference between night‐ and day‐ionization of the upper atmosphere. The observed irregularities are independent of magnetic activity. They can be accounted for only by the dynamo‐theory, and indicate the presence of local air‐circulations in the ionosphere. It is suggested that simultaneous registration of the magnetic elements at points spaced about five times the ionospheric height might delineate the circulation of the upper air, and thus provide perhaps information useful to meteorology.
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