Abstract
The results of measurements of the impedance of a short dipole antenna in the ionosphere at observing frequencies above the electron gyro frequency but near the electron plasma frequency are reported. The reactive component of impedance is found to change from capacitive at the hydrid resonance frequency, X = 1 − Y 2, as predicted by theory. The real component of impedance becomes orders of magnitude larger than the free space radiation resistance in the region bounded by the hybrid frequency, X = 1 − Y 2, and the plasma frequency, X = 1, in qualitative agreement with theory. For X > 1, however, the resistance remains larger than predicted theoretically. Although the large peaks in resistance are accompanied by large enhancements in the apparent radio noise level, it is still not clear what portion of the measured resistance is due to electromagnetic radiation. Other mechanisms such as losses via electrostatic waves may help to account for the differecce between the experimental data and simple theory.
Published Version
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