On the onset of HF-induced airglow at HAARP

Details On the onset of HF-induced airglow at HAARP On the onset of HF-induced airglow at HAARP

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10902305m&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A2, CiteID A02305

Physics

18

Ionosphere: Active Experiments, Ionosphere: Wave/Particle Interactions, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Topside Ionosphere

Scientific paper

Observations of airglow at 630 nm (red line) and 557.7 nm (green line) during the February 2002 campaign at the High Frequency Active Auroral Research Program (HAARP) heating facility are analyzed. We find that during injections toward magnetic zenith (MZ) the green and red lines gain ~5 R within ~1 s and ~20 R within ~10 s, respectively. We term this period the onset of the HF-induced airglow. A model of the onset at magnetic zenith is developed. It accounts for background photoelectrons and dissociative recombination of O2+. It is shown that heating and acceleration of background electrons dominate the airglow onset. We propose a scenario for the generation of strong Langmuir turbulence for injections outside the Spitze region, including magnetic zenith.

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