DOI: 10.1002/2016GL068179
论文题名: Photoelectron-induced waves: A likely source of 150 km radar echoes and enhanced electron modes
作者: Oppenheim M.M. ; Dimant Y.S.
刊名: Geophysical Research Letters
ISSN: 0094-9076
EISSN: 1944-8807
出版年: 2016
卷: 43, 期: 8 起始页码: 3637
结束页码: 3644
语种: 英语
英文关键词: 150 km
; ionosphere
; photoelectron
; plasma
; radar
; simulation
Scopus关键词: Geomagnetism
; Ionosphere
; Photoelectrons
; Photons
; Plasma density
; Plasmas
; Radar
; 150 km
; Density irregularities
; Geomagnetic equator
; Kinetic simulation
; Magnetized plasmas
; Simulation
; Spectral structure
; Wave interactions
; Wave plasma interactions
; electron
; ion
; ionosphere
; kinetic energy
; magnetic property
; photochemistry
; plasma
; radar interferometry
; simulation
; wave spectrum
英文摘要: VHF radars near the geomagnetic equator receive coherent reflections from plasma density irregularities between 130 and 160 km in altitude during the daytime. Though researchers first discovered these 150 km echoes over 50 years ago and use them to monitor vertical plasma drifts, the underlying mechanism that creates them remains a mystery. This paper uses large-scale kinetic simulations to show that photoelectrons can drive electron waves, which then enhance ion density irregularities that radars could observe as 150 km echoes. This model explains why 150 km echoes exist only during the day and why they appear at their lowest altitudes near noon. It predicts the spectral structure observed by Chau (2004) and suggests observations that can further evaluate this mechanism. It also shows the types and strength of electron modes that photoelectron-wave interactions generate in a magnetized plasma. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84992302746&doi=10.1002%2f2016GL068179&partnerID=40&md5=c6cc32fa750b16ee144c917b8ac90fc1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10039
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: Center for Space Physics, Boston University, Boston, MA, United States
Recommended Citation:
Oppenheim M.M.,Dimant Y.S.. Photoelectron-induced waves: A likely source of 150 km radar echoes and enhanced electron modes[J]. Geophysical Research Letters,2016-01-01,43(8).