DOI: 10.1002/2014GL061691
论文题名: Sporadic e ionization layers observed with radar imaging and ionospheric modification
作者: Hysell D.L. ; Munk J. ; McCarrick M.
刊名: Geophysical Research Letters
ISSN: 0094-9703
EISSN: 1944-9434
出版年: 2014
卷: 41, 期: 20 起始页码: 6987
结束页码: 6993
语种: 英语
英文关键词: ionospheric modification
; sporadic E
Scopus关键词: Atmospheric electricity
; E region
; Electromagnetic waves
; Ionization
; Plasma density
; Radar
; Atmospheric waves
; Density irregularities
; Electron gyrofrequency
; High magnetic latitudes
; ionospheric modification
; Naturally occurring
; Sporadic E
; Synthesis method
; Radar imaging
; E region
; emission
; fluoride
; ionization
; latitude
; magnetic property
; radar
英文摘要: Sporadic E ionization layers have been observed in the daytime subauroral ionospheric E layer by a 30 MHz radar in Alaska. The radar detects coherent backscatter from meter-scale field-aligned plasma density irregularities. The irregularities were generated by ionospheric modification - by the emission of strong HF electromagnetic waves directly beneath the layers - making the layers visible to the radar. Aperture-synthesis methods are used to generate imagery of the layers from the radar data. The layers are patchy, with patches organized along fronts spaced by tens of kilometers and propagating slowly toward the southwest. Similar, naturally occurring layers are commonly observed at middle latitudes at night in the absence of ionospheric modification. That the patchy layers can be found at high magnetic latitudes during the day argues that they are most likely produced through the interaction of the ionospheric layer with neutral atmospheric waves and instabilities. Attenuation of the radar echoes when the HF emission frequency exceeded the third harmonic of the electron gyrofrequency was observed and is discussed. Key Points Subauroral, daytime, patchy sporadic E layers have been observedThe layers/QP echoes were likely caused by neutral dynamic instabilityIonospheric modification facilitated the observations ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911378915&doi=10.1002%2f2014GL061691&partnerID=40&md5=3a1289757a822f8ac18739ddd4cad928
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6967
Appears in Collections: 气候减缓与适应
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作者单位: Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States
Recommended Citation:
Hysell D.L.,Munk J.,McCarrick M.. Sporadic e ionization layers observed with radar imaging and ionospheric modification[J]. Geophysical Research Letters,2014-01-01,41(20).