Observations of ELF Signals Over HAARP HF Ionospheric Heater and its Conjugate Region Aboard DEMETER Satellite

Details Observations of ELF Signals Over HAARP HF Ionospheric Heater and its Conjugate Region Aboard DEMETER Satellite Observations of ELF Signals Over HAARP HF Ionospheric Heater and its Conjugate Region Aboard DEMETER Satellite

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm51c0672p&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM51C-0672

Other

2403 Active Experiments, 2483 Wave/Particle Interactions (7867), 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2772 Plasma Waves And Instabilities (2471)

Scientific paper

Generation of ELF waves by ionospheric HF heaters via modulation of the auroral electrojet current is well studied technique [Stubbe and Kopka, 1977]. The main knowledge about physical processes connected with ELF generation up to now has been acquired from theoretical treatment and ground-based observations. On the other hand, there were relatively few space observations [Platino et al., 2006 and references therein] that are important for understanding of ELF waves injection into the magnetosphere and their interaction with energetic particles. In this work we present observations made on the low-earth orbit DEMETER satellite (660 km) that recorded waveforms of E and B fields up to 20 kHz and the flux of energetic electrons in 256 channels from 70 keV to 2.5 MeV while the HAARP HF heater was operating at the full power level of 3600 kW. Observations over the HAARP revealed three regions of ELF field classified by signal intensity and the distance d between the satellite and the magnetic field line of the HAARP. The first big region within d~900 km is where the waves propagate in the Earth-ionosphere waveguide. The second is the region of waves propagating directly from the source in the ionosphere and within 20° cone (d~250 km) around the field line. Also not explained before the third small region of high field (E = 350 μV/m, B = 25 pT) within d≤50 km was observed. In addition, the first space observations of one-hop ELF signal over the HAARP conjugate point were accomplished. They show that the size of the region of detected signal can reach d~600 km while the field intensity is up to E = 4.5 μV/m. Besides the signal directly generated by the HAARP, triggered emissions with E up to 20 μV/m were simultaneously observed.

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