Magnetic zenith enhancement of HF radio-induced airglow production at HAARP

Details Magnetic zenith enhancement of HF radio-induced airglow production at HAARP Magnetic zenith enhancement of HF radio-induced airglow production at HAARP

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30d..18p&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 4, pp. 18-1, CiteID 1169, DOI 10.1029/2002GL016096

Physics

Optics

30

Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Active Experiments, Ionosphere: Wave/Particle Interactions, Ionosphere: Wave Propagation (6934), Ionosphere: Instruments And Techniques

Scientific paper

Airglow production at various beam positions relative to the magnetic field was investigated as part of an optics campaign at HAARP in February 2002. Strong emissions up to several hundred Rayleigh at 630.0 nm and more than 50 R at 557.7 nm were produced in a small spot approximately 6° in diameter located near the magnetic zenith when the transmitter beam was directed up the magnetic field. This effect was observed hundreds of times over a wide range of frequencies and ionospheric conditions. The spot at HAARP appears on average just equatorward of the nominal magnetic field direction, deflects somewhat toward the beam center when the beam is scanned, and varies slightly in size with transmitter frequency. Red-to-green ratios as low as 3 were observed, with both wavelengths showing significant onset delay. Identifiable enhancements in red-line emission were produced down to 2 MW ERP in a power ramp experiment.

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