Ionosphere and Upper Atmosphere
On the onset of HF-induced airglow at HAARP
Article first published online: 13 FEB 2004
Copyright 2004 by the American Geophysical Union.
Journal of Geophysical Research: Space Physics (1978–2012)
Volume 109, Issue A2, February 2004
How to Cite
2004), On the onset of HF-induced airglow at HAARP, J. Geophys. Res., 109, A02305, doi:10.1029/2003JA010205., , and (
- Issue published online: 13 FEB 2004
- Article first published online: 13 FEB 2004
- Manuscript Accepted: 19 DEC 2003
- Manuscript Revised: 2 DEC 2003
- Manuscript Received: 21 AUG 2003
- HF modification experiments;
- artificial airglow onset
 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.