DOI: 10.1002/grl.50327
论文题名: First observations of minority ion (H+) structuring in stimulated radiation during second electron gyroharmonic heating experiments
作者: Bordikar M.R. ; Scales W.A. ; Samimi A.R. ; Bernhardt P.A. ; Brizcinski S. ; McCarrick M.J.
刊名: Geophysical Research Letters
ISSN: 0094-9158
EISSN: 1944-8889
出版年: 2013
卷: 40, 期: 8 起始页码: 1479
结束页码: 1483
语种: 英语
英文关键词: Active experiments
; Ionosphere
Scopus关键词: Heating experiment
; Interaction region
; Ionospheric heating
; Ionospheric modification experiments
; Narrow-band emission
; Parametric decay instability
; Precipitation events
; Stimulated electromagnetic emission
; Emission spectroscopy
; Experiments
; Grain size and shape
; Ionosphere
; Magnetosphere
; Plasmas
; Ions
; altitude
; electromagnetic field
; electromagnetic wave
; emission
; frequency analysis
; ionosphere
; magnetic field
; parameterization
; spectral analysis
; spectral reflectance
英文摘要: This work presents the first observations of unique narrowband emissions ordered near the hydrogen ion (H+) gyrofrequency (fcH) in the stimulated electromagnetic emission spectrum when the transmitter is tuned near the second electron gyroharmonic frequency (2fce) during ionospheric modification experiments. The frequency structuring of these newly discovered emission lines is quite unexpected since H+ is known to be a minor constituent in the interaction region which is near 160 km altitude. The spectral lines are typically shifted from the pump wave frequency by harmonics of a frequency about 10% less than fcH (≈ 800 Hz) and have a bandwidth of less than 50 Hz which is near the O+ gyrofrequency fcO. A theory is proposed to explain these emissions in terms of a parametric decay instability in a multi-ion species plasma due to possible proton precipitation associated with the disturbed conditions during the heating experiment. The observations can be explained by including several percent H+ ions into the background plasma. The implications are new possibilities for characterizing proton precipitation events during ionospheric heating experiments. Key Points First observations of H+ ion structuring in SEE during heating experiment Disturbed magnetic conditions imply proton precipitation likely plays a key role Theory is provided to explain emissions by PDI in multi-ion plasma. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877937969&doi=10.1002%2fgrl.50327&partnerID=40&md5=52c8c5944cef524baf91e259f1ae3c32
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6422
Appears in Collections: 气候减缓与适应
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作者单位: Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute, State University, Blacksburg VA, United States
Recommended Citation:
Bordikar M.R.,Scales W.A.,Samimi A.R.,et al. First observations of minority ion (H+) structuring in stimulated radiation during second electron gyroharmonic heating experiments[J]. Geophysical Research Letters,2013-01-01,40(8).