Effect of HF Heating Array Directivity Pattern on the Frequency Response of Generated ELF/VLF.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK IONOSPHERE RESEARCH LAB
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Directivity patterns at 3.17 MHz and 5.1 MHz are calculated for the HF antenna array at the high power HF heating facility at the Arecibo Observatory in Puerto Rico. The pattern was calculated using pattern multiplication and method of moment techniques. The calculated pattern is shown to be a good approximation to an experimentally measured pattern in one plane of the array. A simple model was used to approximate the effect of the pattern on the frequency response of ELFVLF signals generated by the HF heating. The frequency response was determined at two ELFVLF receiver sites. Results show that ELFVLF generated by side lobes of the HF pattern have sufficient strength to create a ELFVLF generated by side lobes of the HF pattern have sufficient strength to create a ELFVLF interference pattern at receiving locations.
- Atmospheric Physics
- Radiofrequency Wave Propagation