High-latitude pump-induced optical emissions for frequencies close to the third electron gyro-harmonic

Details High-latitude pump-induced optical emissions for frequencies close to the third electron gyro-harmonic High-latitude pump-induced optical emissions for frequencies close to the third electron gyro-harmonic

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w..27k&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 27-1, CiteID 2112, DOI 10.1029/2002GL015744

Physics

20

Ionosphere: Active Experiments, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Particle Acceleration, Ionosphere: Wave/Particle Interactions

Scientific paper

It has been long established that high-power O-mode HF pumping of the ionosphere can produce artificial optical emissions. 630 nm O(1D) photons are produced by pump-accelerated electrons colliding with the F-layer neutral oxygen. However, the mechanism for artificial electron acceleration remains unclear. Competing theories include Langmuir and upper-hybrid turbulence. Pump-induced HF coherent radar backscatter power is closely linked with upper-hybrid turbulence, both of which are known to reduce when pumping on an electron gyro-harmonic frequency. On 3 November 2000, the EISCAT HF facility was systematically stepped in frequency through the 3rd gyro-harmonic. A significant reduction in the artificial optical intensity coincides with that of CUTLASS radar backscatter power. This is conclusive proof that upper-hybrid turbulence is intimately linked to the mechanism for high-latitude pump-induced aurora, at least for 630 nm photons and the steady state.

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