Abstract
PROF. APPLETON'S recent letter1, reporting the measurement of the magnetic intensity H in the upper ionised region of the atmosphere, illustrates anew the power and value of radio methods of upperair investigation. It affords clear evidence, which probably few workers on the earth's magnetism expected ever to gain, of the decrease of the field with height. This decrease is predicted by the Gaussian potential theory, but not without some small uncertainty, due to the slight non-uniformity of the earth's magnetisation, and also to the existence of electric currents in (and perhaps beyond) the atmosphere.
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NATURE, 158, 793, May 26, 1934.
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CHAPMAN, S. Radio Exploration of the Ionosphere. Nature 133, 908 (1934). https://doi.org/10.1038/133908b0
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DOI: https://doi.org/10.1038/133908b0
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