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The near-field resonance cones that extend outward from a small antenna or probe in a magnetoplasma have been detected at a second probe by utilising the nonlinear rectification properties of the probe–plasma interface. Seen from the point of view of plasma diagnostics, this constitutes a very simple procedure for laboratory measurement of the electron plasma frequency when the electron gyrofrequency is known.
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Keith G. Balmain (1973) studied this question.
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