HR: 14:00h
AN: SA53C-01 INVITED     [Abstracts]
TI: ELF/VLF Wave-injection Experiments with HAARP
AU: * Inan, U S
EM: inan@stanford.edu
AF: Stanford University, Packard Bldg., Rm. 355, 350 Serra Mall, Stanford University, CA 94305, United States
AB: The potential use of modulated HF heating of the lower ionosphere as a means to generate ELF/VLF waves has long been recognized. Located conveniently at L ≅ 4.9, thus lying on closed sub-auroral field lines most of the time, the High-Frequency Active Auroral Research Program (HAARP) heater in Gakona, Alaska is well positioned for the conduct of ELF/VLF wave-injection experiments for magnetospheric wave-particle interaction studies. Early results (2004) have alreay demonstrated that whistler-mode wave amplification can be initiated by ELF/VLf signals injected from HAARP, leading to multiple-hop propagation of signals between hemispheres and triggering of discrete emissions. With the upcomign completion of the upgrade of HAARP to full power (3.6 MW radiated), a new set of experiments have become possible, and the first opportunity for the conduct of such experiments is now before us. During February 23-March 6th, Stanford University personnel will be deploying two large Buoys equipped with ELF/VLF erceivers in the geomagneticaly conjugate region of HAARP, and will also conduct continuous ELF/VLF observations on the research ship which will deploy them. The experiments are aimed at generating specially designed ELF/VLF modulation formats, for initiation of wave growth, emission triggering and excitation of one-hop and two-hop whistler-mode waves. ELF/VLf observations will be conducted on teh ship and buoys near the conjugate region, but also on several distributed sites in Alaska as well as on teh DEMETER spacecraft. In this paper, we will discuss these experiments and present initial results from them. This papers constitutes a brief summary of the extensive work contributed by many other not-listed authors, at Stanford University, at AFRL, ONR, and at LPCE/CNRS in Orleans. The presenter listed as the single author is simply the team leader, listed solely for purposes of brevity.
DE: 2403 Active experiments
DE: 2483 Wave/particle interactions (7867)
DE: 2487 Wave propagation (0689, 3285, 4275, 4455, 6934)
DE: 2736 Magnetosphere/ionosphere interactions (2431)
DE: 2774 Radiation belts
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly