DOI: 10.1002/2015GL066806
论文题名: Dynamics of density cavities generated by frictional heating: Formation, distortion, and instability
作者: Zettergren M.D. ; Semeter J.L. ; Dahlgren H.
刊名: Geophysical Research Letters
ISSN: 0094-8355
EISSN: 1944-8086
出版年: 2015
卷: 42, 期: 23 起始页码: 10120
结束页码: 10125
语种: 英语
英文关键词: density cavities
; high latitude
; instabilities
; ionosphere
Scopus关键词: Electric fields
; Geomagnetism
; Ionosphere
; Ionospheric measurement
; Plasma density
; Stability
; Density cavity
; Density irregularities
; Electrostatic modeling
; Gradient-drift instability
; High Latitudes
; Plasma density gradient
; Simulation studies
; Strong electric fields
; Friction
; atmospheric electricity
; electric field
; friction
; heating
; instability
; ionosphere
英文摘要: A simulation study of the generation and evolution of mesoscale density cavities in the polar ionosphere is conducted using a time-dependent, nonlinear, quasi-electrostatic model. The model demonstrates that density cavities, generated by frictional heating, can form in as little as 90 s due to strong electric fields of ∼120 mV/m, which are sometimes observed near auroral zone and polar cap arcs. Asymmetric density cavity features and strong plasma density gradients perpendicular to the geomagnetic field are naturally generated as a consequence of the strong convection and finite extent of the auroral feature. The walls of the auroral density cavities are shown to be susceptible to large-scale distortion and gradient-drift instability, hence indicating that arc-related regions of frictional heating may be a source of polar ionospheric density irregularities. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953635236&doi=10.1002%2f2015GL066806&partnerID=40&md5=21be8ab7f486c79b3718d8d35d916570
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7971
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: Department of Physical Sciences, Center for Space An Atmospheric Research, Embry-Riddle Aeronautical University, Daytona Beach, FL, United States
Recommended Citation:
Zettergren M.D.,Semeter J.L.,Dahlgren H.. Dynamics of density cavities generated by frictional heating: Formation, distortion, and instability[J]. Geophysical Research Letters,2015-01-01,42(23).