Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33a1762a&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA33A-1762
Physics
[0654] Electromagnetics / Plasmas, [2403] Ionosphere / Active Experiments, [2487] Ionosphere / Wave Propagation, [6929] Radio Science / Ionospheric Physics
Scientific paper
A new dual-beam HF heating model is employed to predict the effects of additional HF heating on ELF/VLF wave generation. Modeling predictions are compared with experimental observations performed in February 2008 and in July 2010, at which times the High-frequency Active Auroral Research Program (HAARP) HF heater in Gakona, Alaska performed a series of dual-beam ELF/VLF wave generation experiments. In 2008, HAARP employed a transmission format designed to determine the effect of additional HF heating on ELF/VLF wave amplitudes as a function of HF frequency and peak HF power. Model predictions match observations within reason, considering that the ambient conditions of the ionosphere are not known. In 2010, HAARP transmitted a dual-beam format that allowed for the detection of the total propagation delay between HAARP transmission and ELF/VLF signal detection on the ground. The time-of-arrival (TOA) was measured under dual-beam and single-beam heating conditions for comparative studies. Modeling results for this more recent data set are expected to be unveiled in December. Based on other recent TOA observations, however, it is expected that ionospheric reflections, which can be detected and separated using the TOA technique, may play a more important role than accounted for previously. For each of these cases, the new dual-beam HF heating model makes deterministic predictions (for a variety of ambient ionospheric conditions) regarding the relative change in ELF/VLF amplitude observed on the ground (as a function of HF frequency and power) and the dominant signal TOA. In this paper, we present a complete analysis comparing experimental observations of ELF/VLF wave generation under dual-beam heating conditions with the predictions of the dual-beam HF heating model. Based on the dual-beam TOA observations, we suggest several model improvements to be implemented in the future and furthermore provide several recommendations to guide future dual-beam heating experiments.
Agrawal Dakshi
Moore Robert C.
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