DOI: 10.1002/2015GL063064
论文题名: First artificial periodic inhomogeneity experiments at HAARP
作者: Hysell D.L. ; McCarrick M.J. ; Fallen C.T. ; Vierinen J.
刊名: Geophysical Research Letters
ISSN: 0094-8909
EISSN: 1944-8640
出版年: 2015
卷: 42, 期: 5 起始页码: 1297
结束页码: 1303
语种: 英语
英文关键词: API
; ionospheric modification
Scopus关键词: Density of gases
; Diffusion
; Doppler effect
; Ambipolar diffusion coefficients
; API
; Artificial periodic inhomogeneities
; Decay time constant
; Ground-based instruments
; High-frequency active auroral research programs
; ionospheric modification
; Plasma temperature
; Signal to noise ratio
; altitude
; antenna
; Doppler effect
; ground-based measurement
; inhomogeneity
; ionosphere
; periodicity
; signal-to-noise ratio
; software
; wind direction
英文摘要: Experiments involving the generation and detection of artificial periodic inhomogeneities 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 (10 μs) 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 and 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. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84925709289&doi=10.1002%2f2015GL063064&partnerID=40&md5=64d32ed8c34a641c3fae7deea038e389
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8525
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States
Recommended Citation:
Hysell D.L.,McCarrick M.J.,Fallen C.T.,et al. First artificial periodic inhomogeneity experiments at HAARP[J]. Geophysical Research Letters,2015-01-01,42(5).