"Experiments involving the generation and detection of artificial periodic inhomogeneities (API) have been performed at the High-frequency Active Auroral Research Program (HAARP) facility.
Irregularities were created using powerful X-mode HF emissions and then probed using short (10μs) X- and O-mode pulses. Reception was performed using a portable software-defined receiver together with the crossed-rhombic antenna from the local ionosonde.
Echoes were observed reliably between about 85-140 km altitude with signal-to-noise ratios as high as about 30 dB. The Doppler shift of the echoes can be associated with the vertical neutral wind in this altitude range.
Small but persistent Doppler shifts were observed. The decay time constant of the echoes is meanwhile indicative of the ambipolar diffusion coefficient which depends on the plasma temperature, composition, and neutral gas density.
The measured time constants appear to be consistent with theoretical expectations and imply a methodology for measuring neutral density profiles.
The significance of thermospheric vertical neutral wind and density measurements which are difficult to obtain using ground-based instruments by other means is discussed."
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This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/2015GL063064
Publication History
- Accepted manuscript online: 16 FEB 2015 10:24AM EST
- Manuscript Revised: 10 FEB 2015
- Manuscript Accepted: 10 FEB 2015
- Manuscript Received: 7 JAN 2015
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MEDIA CORRECTION MUST BE MADE! HAARP is not closed.
After reading these nonsense stories about shutdown , I must point out how the disinformation started.
Obviously the ARRL is full of the old stuff, and the people who repeated the false shutdown story now must correct themselves.
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