Kilometer-scale Structure in HF-induced Airglow at the HAARP Facility

Details Kilometer-scale Structure in HF-induced Airglow at the HAARP Facility Kilometer-scale Structure in HF-induced Airglow at the HAARP Facility

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43b1592k&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43B-1592

Physics

Optics

2403 Active Experiments, 2407 Auroral Ionosphere (2704), 2439 Ionospheric Irregularities, 2494 Instruments And Techniques

Scientific paper

The High Frequency Active Auroral Research Program (HAARP) is a joint Air Force and Navy facility which is used to conduct ionospheric modification experiments. Artificial airglow was first observed at HAARP in 1999 [Pedersen and Carlson, 2001] and a successful optics campaign in 2001 showed that this airglow could be consistently produced by directing the HF beam along the magnetic field lines [Pedersen et al., 2003]. Artificial airglow experiments at HAARP since then have been used to explore the relationship of electron gyroharmonic transmissions and airglow intensity [Djuth et al., 2005; Kosch et al., 2005], compare airglow measurements to coherent and incoherent scatter radar data [Kosch et al., 2005; Kosch et al., 2007], and observe the altitude profiles and tomography of the airglow with the aid of multiple camera locations [Pedersen et al., 2008]. In 2003, a heating experiment during auroral conditions unexpectedly resulted in artificial airglow intense enough to be viewed by the naked eye [Pedersen and Gerken, 2005]. Images of small-scale features in artificial airglow serve as a passive means of measuring ionospheric structure. It is important to understand ionospheric structure not only for basic research purposes but also for applications such as improved satellite communications. Telescopic observations of artificial airglow have been conducted at HAARP since 2000, first with a prototype instrument deployed by Stanford University and then by the HAARP telescopic imaging system. Recently, bright airglow emissions were observed on multiple nights during the 2008 winter campaign. Two nights of particular interest were February 26 and 27 with small-scale structure observed by the telescope on both nights. An overview of this system's capabilities and key observations thus far will be presented.

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