Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa42a..02i&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA42A-02
Other
2403 Active Experiments, 2437 Ionospheric Dynamics, 2483 Wave/Particle Interactions (7867), 2736 Magnetosphere/Ionosphere Interactions (2431), 2774 Radiation Belts
Scientific paper
Active wave-injection experiments constitute an excellent tool for investigation of the mechanisms and effects of magnetospheric wave-particle interactions, primarily because of the fact that the known properties of the injected signals allow quantitative interpretation of wave amplification, emission triggering, and resultant precipitation of energetic radiation belt electrons. One of the important tools available for such experimentation is the HAARP HF heating facility, which allows for the generation of ELF/VLF waveforms with intricately detailed frequency-time formats, to investigate properties of the cyclotron resonant growth such as rapid exponential growth, saturation, and entrainment. Observations of the amplified and triggered signals can be made on the ground, in the conjugate hemisphere and in the hemisphere of HAARP, as well as on satellites such as DEMETER. Another tool for VLF wave-injection experiments is the U.S. Navy VLF transmitters operating in the 18-24 kHz range, which can be pulsed with predetermined on/off formats to facilitate detection and identification of electron precipitation produced by the pitch angle scattering of electrons near the equatorial plane. The precipitating electrons can be observed on satellites (e.g., DEMETER), as well as via the associated subionospheric VLF perturbation signatures. In this paper, we review recent results from active ELF/VLF wave-injection experiments, conducted both with HAARP and with VLF transmitters.
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