Computer Science – Sound
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13a1478m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA13A-1478
Computer Science
Sound
[0654] Electromagnetics / Plasmas, [2403] Ionosphere / Active Experiments, [2494] Ionosphere / Instruments And Techniques, [6934] Radio Science / Ionospheric Propagation
Scientific paper
Quantifying the ambient and HF-modified characteristics of the D-region ionosphere in the vicinity of ionospheric HF heaters has historically proven to be a difficult task. For example, the electron density in the 60-90 km altitude range is typically too low to employ radio-sounding techniques; LIDAR observations typically require significant temporal averaging, precluding the investigation of physical processes that occur on sub-millisecond time scales; ELF/VLF wave generation experiments typically have difficulty providing reliable altitude resolution and also cannot experimentally distinguish between the spatial distribution of the ionospheric conductivity modulation produced by modulated HF heating and that of the current-driving electric fields associated with the auroral electrojet. Yet, the majority of HF signal absorption occurs in this region of the ionosphere, and the ability to characterize HF absorption in this region benefits a wide range of ionospheric HF heating experiments. In this paper, we discuss a new D-region probing technique that combines ionosonde-style radio sounding with ELF/VLF cross-modulation experiments to estimate the ambient and modified altitude-profile of D-region absorption as a function of HF frequency. Initial theoretical results are presented and discussed in the context of the present capabilities of the HAARP HF transmitter in Gakona, Alaska.
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