This paper describes experiments designed to measure the radiation patterns of a longitudinal wave excited in a warm plasma by both monopole and dipole antennas. The longitudinal wave used in this experiment is the low‐frequency ion acoustic wave that propagates with a phase velocity [γkTe/M/i]½. Experimental results agree well with the theoretical predicted radiation pattern.

We describe a relatively simple experiment which demonstrates the concept of dispersion of electromagnetic pulses. The experiment uses standard microwave equipment and clearly shows the spreading of a pulse associated with dispersion.

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We describe here a series of time-of-flight experiments designed to investigate propagating electron plasma waves in a dc mercury-vapor discharge based upon the development of a phase-coherent nanosecond sine-wave burst. Signals of appreciable amplitude are observed to propagate with a finite velocity on the order of the electron thermal velocity and can be damped by increasing the electron neutral collision frequency. Multiple reflections of the signal are also detected.

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