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

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

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106811b&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 6, CiteID L06811

Physics

7

Electromagnetics: Wave Propagation (4275), Electromagnetics: Plasmas, Magnetospheric Physics: Plasma Waves And Instabilities, Magnetospheric Physics: Ring Current, Radio Science: Waves In Plasma

Scientific paper

We report new observations from the CLUSTER spacecraft of strong excitation of lower hybrid (LH) waves by electromagnetic (EM) whistler mode waves at altitudes >=20,000 km outside the plasmasphere. Previous observations of this phenomenon occurred at altitudes <=7000 km. The excitation mechanism appears to be linear mode coupling in the presence of small scale plasma density irregularities. These observations provide strong evidence that EM whistler mode waves are continuously transformed into LH waves as the whistler mode waves propagate at high altitudes beyond L ~ 4. This may explain the lack of lightning generated whistlers observed in this same region of space.

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