Abstract
IN 1935, two of us1 reported the results of experiments in which pulses were reflected from the ionosphere using a frequency less than the magneto-ionic gyro-frequency and in which the polarization of the echoes was determined by means of a “circularly polarized” receiving aerial. We found doubled echoes from region F on frequencies below about 1·0 Mc./s. and we showed that the echo of shorter delay had left-handed polarization and that of greater delay was right-handed. We therefore interpreted the two echoes as magneto-ionic components, and this interpretation was supported by observations of the change over of the reflection from region F to region E.
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References
Farmer and Ratcliffe, NATURE, 135, 831 (1935).
Martyn and Munro, NATURE, 141, 159 (1938).
Bajpai and Mathur, Indian. J. Phys., 11, 165 (1937).
Appleton, Proc. Union Rad. Sci. Int. (Washington, 1927).
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APPLETON, E., FARMER, F. & RATCLIFFE, J. Magnetic Double Refraction of Medium Radio Waves in the Ionosphere. Nature 141, 409–410 (1938). https://doi.org/10.1038/141409a0
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DOI: https://doi.org/10.1038/141409a0
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