Accession Number : AD0435736

Title :   INVESTIGATION OF PHASE INTERACTION AS A MEANS FOR THE STUDY OF THE LOWER IONOSPHERE,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK IONOSPHERE RESEARCH LAB

Personal Author(s) : Weisbrod,S.

Report Date : 01 MAR 1964

Pagination or Media Count : 161

Abstract : The research described is concerned with a new technique for the study of the lower ionosphere. This technique is based on the simultaneous observations of phase and amplitude wave interaction. The magnitude of the observed phase perturbation is on the order of 10-4 radians (approximately 20 seconds of arc). To measure, or even to detect, such minute changes in the phase of ionospherically reflected echoes, which are subject to rapid amplitude fading and phase tumbling, required the development of special techniques and instrumentation. The scheme is based on the extension of the Fejer pulse technique which has been used in the past by a number of investigators in the study of the amplitude interaction. The theory of interaction is extended and generalized by the introduction of the complex coefficient of interaction, which embodies both amplitude and phase effects. The experimental results are in very good qualitative agreement with the theoretical computations based on simple but realistic ionospheric models. On the average, below 75 or 80km., the phase perturbations, measured in radians, are stronger than the amplitude perturbations. (Author)

Descriptors :   (*IONOSPHERIC PROPAGATION, ELECTROMAGNETIC WAVE REFLECTIONS), PHASE MEASUREMENT, RADIO WAVES, RADIO TRANSMISSION, ATMOSPHERIC REFRACTION, INSTRUMENTATION, WIRING DIAGRAMS, PHASE MODULATION, AMPLITUDE MODULATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE