Y. S. N. Murty

Bio: Y. S. N. Murty is an academic researcher. The author has contributed to research in topics: Polarization (waves) & Linear polarization. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.

Polarization parameters of the downcoming radio wave

Abstract: The phase difference between the normal and the abnormal components of the magnetic vector of the radio wave (i.e., the components in and at right angles to the plane containing the wave normal and the direction of the earth's magnetic field) and the limits of the tilt angle of the major axis of the polarization ellipse (traced out by the electric vector) measured anticlockwise with respect to the direction of the magnetic north for the ordinary and the extraordinary modes of propagation have been obtained on the ray theory of propagation through the ionosphere. The values are given in a table for the ordinary and the extraordinary modes in both the hemispheres for regions below and above the level of ionospheric reflection. Scott's treatment of the same problem on the ray theory and the results given by Roy and Verma on the basis of the coupled wave equations of Saha and others are reviewed. It is shown that the discrepancies in the results of the polarization parameters obtained by different workers on ray theory are only apparent and arise out of the differences in the forms and notations used in the different formulas. It is also shown that the discrepancies in the limits of the major axis of the polarization ellipse obtained from the ray theory and the wave theory are due to the interchange in the expressions for the amplitude ratio of the normal to the abnormal components for the ordinary and the extraordinary waves given by Saha and others. The experimental results of Roy and Verma are shown to confirm our theoretical conclusions about the limits of the tilt angle of the polarization ellipse.

Radio-Wave Propagation during World War II

Abstract: Many publications have appeared which describe the very extensive wartime radio-wave propagation research. References to some of these summaries are given which cover some aspects of this research as carried out in the United States, England, the U.S.S.R., Japan and Germany. These summaries are most complete for the work done in the United States, England and Japan. A summary is then given of some of the wartime research in the United States on direction finders and the polarization of downcoming ionospheric radio waves. This is followed by some heretofore unpublished material on Japanese ionospheric research which, by way of example, clearly indicates that an April, 1942, paper by Maeda, Uyeda and Shinkawa contains the first definite identification and interpretation of the F2-layer longitude effect. Finally a brief summary is given of a few selected topics in propagation research which arose out of the wartime development of radar.

On the magnetoionic components of radio waves in the ray and wave treatments

Abstract: It is shown that what Saha, Banerjea, and Guha called the O mode in their wave treatment is actually the X mode in the same treatment, and this is identified with the X mode in the ray treatment. After correction, it is shown that the expressions for the wave polarization corresponding to the respective modes are identical in both treatments and that the phase difference between the normal and the abnormal components of the magnetic vector of the radio wave, as calculated according to the wave treatment, is also the same as that deduced according to the ray treatment.