Contributions to ionospheric physics and radio astronomy

TL;DRAbstract

The first chapter in the thesis is concerned with the propagation of electromagnetic waves in the ionosphere and in particular with the explanation of magneto-ionic effects observed by echo sounding. The papers on triple splitting, on gyro echoes and on the trapping of cosmic noise give, it is believed, the first satisfactory accounts of these phenomena. In the second chapter the observation and theory of natural electromagnetic radiation propagated in the terrestrial magnetosphere is discussed. Included in this group of papers is one on whistling atmospherics in which the existence and the properties of nose whistlers were predicted Another gives the first proposal that the natural very low frequency radiations may be caused by Cerenkov radiation from fast electrons in the magnetosphere. The remainder describe new techniques for observing the radiation and consequent studies of its geographical distribution radiation and relation to geomagnetic storms. The papers in Chapter three all

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