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Excitation of Electro‐Acoustic Lateral Waves in a Compressible Plasma by a Non‐Electromagnetic Source
Author(s) -
Samaddar S. N.
Publication year - 1967
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.19674740308
Subject(s) - physics , acoustic wave , mechanical wave , ion acoustic wave , surface wave , plasma , longitudinal wave , excitation , wave propagation , acoustics , rayleigh wave , excited state , mechanics , optics , atomic physics , quantum mechanics
This paper considers the possibility of excitation of lateral waves in a hot plasma in contact with a perfectly conducting boundary by a mechanical body source. These lateral waves being incident on the conducting surface at a critical angle from the source travel a certain distance along the surface with the phase velocity of light in a cold plasma and the waves are then reflected back at the critical angle to the observer in the compressible plasma. The incident and reflected portions of the path are traversed by the waves with the phase velocity of an acoustic wave in a compressible plasma. It is shown that these electro‐acoustic lateral waves can be excited also by an electric dipole oriented in the same direction as the mechanical body source. The amplitudes of the waves excited by these two different sources are compared.