DOI: 10.1002/2014GL062271
论文题名: A missing variable in solar wind-magnetosphere-ionosphere coupling studies
作者: Sergeev V.A. ; Sormakov D.A. ; Angelopoulos V.
刊名: Geophysical Research Letters
ISSN: 0094-9520
EISSN: 1944-9251
出版年: 2014
卷: 41, 期: 23 起始页码: 8215
结束页码: 8220
语种: 英语
英文关键词: magnetic variations
; plasma sheet control
Scopus关键词: Aluminum
; Ionosphere
; Ionospheric measurement
; Magnetosphere
; Plasma sheaths
; Solar wind
; Auroral electrojets
; Magnetic perturbation
; Magnetic variation
; Magnetosphere-ionosphere coupling
; Magnetospheric activity
; Plasma sheet
; Solar wind velocity
; Substorm expansion
; Magnetoplasma
; acceleration
; aurora
; electrojet
; electron density
; ionosphere
; magnetic field
; magnetosphere
; plasma
; solar wind
英文摘要: The auroral electrojet (AL) index is commonly used to characterize the magnetospheric activity. The ground magnetic perturbations that comprise AL are formed predominantly by Hall currents, however, and the Hall conductivity is sensitive to plasma sheet Te and Ne parameters, which control the production of energetic electrons via their field-aligned acceleration. Using AL index and nightside-dawn sector plasma sheet electron data, we demonstrate that a hotter, lower density plasma sheet is associated with stronger ground magnetic variations in the nightside auroral zone than a colder, denser plasma sheet under similar solar wind driving conditions. The Te1/2/Ne-dependent difference may exceed a factor of 4 during the growth phase events, whereas the acceleration during substorm expansions smears it out. Background plasma sheet state is mainly controlled by the solar wind velocity and density. We suggest that plasma sheet Te1/2/Ne variable constitutes an important (and currently ignored) variable in studies of solar wind-magnetosphere-ionosphere coupling. Key PointsPlasma sheet Te/Ne controls electron acceleration and Hall conductanceAssociated AL difference up to an order of magnitude in the absence of substormsSW density and velocity dictate plasma sheet Te/Ne in the absence of substorms ©2014. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921601052&doi=10.1002%2f2014GL062271&partnerID=40&md5=c456530c78d98c3af6b07332322c49c6
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6784
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Earth's Physics Department, St. Petersburg State University, St. Petersburg, Russian Federation
Recommended Citation:
Sergeev V.A.,Sormakov D.A.,Angelopoulos V.. A missing variable in solar wind-magnetosphere-ionosphere coupling studies[J]. Geophysical Research Letters,2014-01-01,41(23).