On the effective altitude of the HAARP induced ionospheric ELF/VLF current modulation and multi-beam vertical ELF/VLF interference

Details On the effective altitude of the HAARP induced ionospheric ELF/VLF current modulation and multi-beam vertical ELF/VLF interference On the effective altitude of the HAARP induced ionospheric ELF/VLF current modulation and multi-beam vertical ELF/VLF interference

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33a1763g&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA33A-1763

Physics

[2403] Ionosphere / Active Experiments, [2409] Ionosphere / Current Systems, [2467] Ionosphere / Plasma Temperature And Density

Scientific paper

The HF heating facility of the High Frequency Active Auroral Research Program (HAARP) has been used to generate ELF/VLF waves via modulated heating of the lower ionosphere for several years. Here we investigate the effective altitude of the modulated electrojet currents as a function of HF frequency and harmonic number of the ELF/VLF modulation. In one experiment ELF/VLF frequency time ramps are generated and a time of arrival determination technique is used to estimate effective dipole altitude from observations at ELF/VLF receivers located within 100 km of the HF array. In a second experiment, we take advantage of altitude difference as a function of HF frequency and harmonic number to create a vertical phased array. Two different HF beams are modulated simultaneously with increasing ELF/VLF relative phase separation. An enhancement is observed for relative phase difference of 30-60 degrees between 1st and 2nd ELF/VLF harmonics of the two beams. Simulations of the HF heating process in the ionosphere confirm that an effective altitude separation of ~10 km is achievable using different HF frequencies and 2nd order harmonics of ELF/VLF modulation. The observed enhancement for two HF beams with different ELF/VLF phases is thus interpreted to be a result of constructive interference in the vertical direction.

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