HR: 0830h
AN: SM11C-1181    [PDF]
TI: CLUSTER observations of lower hybrid waves excited at high altitudes by electromagnetic whistler mode signals from HAARP
AU: * Bell, T F
EM: bell@nova.stanford.edu
AF: Star Laboratory, Stanford Univ,, Packard Buikding, Stanford, CA 94305 United States
AU: Inan, U S
EM: inan@nova.stanford.edu
AF: Star Laboratory, Stanford Univ,, Packard Buikding, Stanford, CA 94305 United States
AU: Platino, M
AF: Star Laboratory, Stanford Univ,, Packard Buikding, Stanford, CA 94305 United States
AU: Pickett, J
AF: University of Iowa, Department of Physics and Astronomy, Van Allen Hall, Iowa City, IA 52242 United States
AU: Kossey, P A
AF: Air Force Research Laboratory, 29 Randolph Rd Hanscom Air Force Base, Hanscom AFB, MA 01731 United States
AU: Kennedy, E J
AF: Naval Research Laboratory, 4555 Overlook Ave, SW, Washington, DC, DC 20375 United States
AB: We report new observations from the CLUSTER spacecraft of strong excitation of lower hybrid waves by electromagnetic whistler mode waves at altitudes of roughly 20,000 km outside the plasmasphere. Previous observations of this phenomenon have been limited to altitudes less than 7000 km. The excitation mechanism appears to be linear mode coupling in the presence of small scale plasma density irregularities. The wavelengths of the excited lower hybrid waves, as deduced from their doppler shifts, appear to lie in the 15 - 1500 m range. These observations provide strong evidence that electromagnetic whistler mode waves are continuously transformed into lower hybrid waves as the whistler mode waves propagate at high altitudes beyond L = 4. This finding may explain the lack of lightning generated whistlers observed in this same region of space.
DE: 0619 Electromagnetic theory
DE: 0669 Scattering and diffraction
DE: 0689 Wave propagation (4275)
DE: 2403 Active experiments
DE: 2772 Plasma waves and instabilities
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting