Physics – Plasma Physics
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11310201g&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A10, CiteID A10201
Physics
Plasma Physics
9
Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Space Plasma Physics: Nonlinear Phenomena (4400, 6944), Space Plasma Physics: Active Perturbation Experiments, Ionosphere: Active Experiments, Magnetospheric Physics: Radiation Belts
Scientific paper
The HF dipole array of the High Frequency Active Auroral Research Program (HAARP) in Gakona, Alaska, was recently upgraded to 180 elements, facilitating operations at a total radiated power level of 3.6 MW and an effective radiated power of ~575 MW. In the first experiments at the new power level, the HAARP array is used for magnetospheric wave injection. Modulated heating of auroral electrojet currents in the ionosphere yields radiation in the ELF/VLF frequency range. The HAARP-generated signals are injected into the magnetosphere, where they propagate in the whistler mode in field-aligned ``ducts,'' allowing them to be observed at the conjugate point on a ship-borne receiver and on autonomous buoy platforms. The observation of the 1-hop signals is accompanied by the observation of associated 2-hop components in the northern hemisphere, which have reflected from the ionospheric boundary in the southern hemisphere. The observed signals are accompanied by triggered emissions and exhibit temporal amplification of 15-25 dB/s and bandwidth broadening to ~50 Hz. Amplification occurs at injected signal frequencies selected in near real time on the basis of observations of natural emission activity, and only certain components of the frequency-time formats transmitted are amplified. Observations at multiple sites and dispersion analysis show that the signals are injected into the magnetosphere directly above the HF heater. The duration of echo observation and the prevalence of 1-hop observations are consistent with statistics from 1986 Siple Station experiments. The particle-trapping wave amplitude near the magnetic equator is estimated in the range 0.1-0.4 pT and gyroresonance with 10 keV-100 keV electrons.
Cohen Morris B.
Gibby A. R.
Gokowski M.
Inan Umran S.
No associations
LandOfFree
Magnetospheric amplification and emission triggering by ELF/VLF waves injected by the 3.6 MW HAARP ionospheric heater does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetospheric amplification and emission triggering by ELF/VLF waves injected by the 3.6 MW HAARP ionospheric heater, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetospheric amplification and emission triggering by ELF/VLF waves injected by the 3.6 MW HAARP ionospheric heater will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-853023