CLUSTER observations of lower hybrid waves excited at high altitudes by electromagnetic whistler mode signals from HAARP

Details CLUSTER observations of lower hybrid waves excited at high altitudes by electromagnetic whistler mode signals from HAARP CLUSTER observations of lower hybrid waves excited at high altitudes by electromagnetic whistler mode signals from HAARP

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11c1181b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM11C-1181

Physics

0619 Electromagnetic Theory, 0669 Scattering And Diffraction, 0689 Wave Propagation (4275), 2403 Active Experiments, 2772 Plasma Waves And Instabilities

Scientific paper

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.

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