IN a recent paper1 on the direction of arrival of high-frequency atmospherics, curves were given showing the horizontal component of the direction of arrival of an electromagnetic disturbance, which I termed hiss type atmospherics, plotted against time of day. These curves showed that the horizontal component of the direction of arrival changed nearly 360° in 24 hours and, at the time the paper was written, this component was approximately the same as the azimuth of the sun, leading to the assumption that the source of this disturbance was somehow associated with the sun.
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Karl G. Jansky, “Directional Studies of Atmospherics at High Frequencies”, Proc. Inst. Rad. Eng., 20, 1920; 1932.
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JANSKY, K. Radio Waves from Outside the Solar System. Nature 132, 66 (1933). https://doi.org/10.1038/132066a0
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