Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa43a1881f&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA43A-1881
Physics
[0654] Electromagnetics / Plasmas, [2403] Ionosphere / Active Experiments, [2487] Ionosphere / Wave Propagation, [6934] Radio Science / Ionospheric Propagation
Scientific paper
Time-of-arrival (TOA) analysis is applied to observations performed during ELF/VLF wave generation experiments at the High-frequency Active Auroral Research Program (HAARP) HF transmitter in Gakona, Alaska. Geometric modulation is used together with a variable pulse length modulation format to determine the ideal arc length maximizing the ELF/VLF signal magnitude observed on the ground. Observations indicate that the ELF/VLF signal magnitude increases with arc length to a certain extent, after which the magnitude decreases. The end result is that an optimal arc length is identified, maximizing ELF/VLF signal magnitude and minimizing the HF power required to produce that magnitude. A standard frequency analysis is presented together with the TOA analysis to provide a complete context for the experimental results.
Fujimaru S.
Moore Robert C.
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