Abstract
IN a recent communication in Nature, Sir Edward Appleton1 has brought forward unmistakable evidence of geomagnetic control of the distribution of ionization in the F2 layer. In particular, he has shown from an examination of the world data that, “for noon equinox conditions, there is a belt of low values of fF2 circling the earth and centred roughly on the magnetic equator”. The geomagnetic control raises the important question of the nature of the source of the control. Since magnetic disturbances and auroras are also subject to similar control, one can envisage, in common with the probable origins of these geophysical phenomena, two possible sources:
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References
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MITRA, S. Geomagnetic Control of Region F2 of the Ionosphere. Nature 158, 668–669 (1946). https://doi.org/10.1038/158668a0
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DOI: https://doi.org/10.1038/158668a0
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