DOI: 10.1002/2015GL065842
论文题名: THEMIS observations of tangential discontinuity-driven foreshock bubbles
作者: Liu Z. ; Turner D.L. ; Angelopoulos V. ; Omidi N.
刊名: Geophysical Research Letters
ISSN: 0094-8556
EISSN: 1944-8287
出版年: 2015
卷: 42, 期: 19 起始页码: 7860
结束页码: 7866
语种: 英语
英文关键词: foreshock bubbles
; ion foreshock
; kinetic phenomena
; shock processes
Scopus关键词: Ionosphere
; Ions
; Magnetosphere
; Solar wind
; Advanced composition
; Kinetic phenomena
; Magnetic field components
; Magnetosphere-ionosphere systems
; Multi-point observation
; Observational errors
; Solar wind discontinuity
; Tangential discontinuities
; Earthquakes
; acceleration
; discontinuity
; foreshock
; ion exchange
; ionosphere
; kinetics
; magnetic field
; magnetosphere
; solar wind
英文摘要: Foreshock bubbles (FBs), transient ion foreshock phenomena formed from highly concentrated suprathermal foreshock ions upstream of solar wind discontinuities, produce intense disturbances in the magnetosphere-ionosphere system and can accelerate particles to even higher energies. Rotational discontinuities are known to drive FBs. Tangential discontinuities (TDs), however, have not previously been considered as drivers of FBs because they have no normal magnetic field component, preventing access of field-aligned particles upstream. However, given that suprathermal foreshock ions have gyroradii larger than the width of TDs, they may pass upstream of TDs and generate FBs. Using multipoint observations from Advanced Composition Explorer, WIND, and Time History of Events and Macroscale Interactions during Substorms (THEMIS), we report on two cases of TD-driven FBs. The FBs were identified using classical FB selection criteria, and the driving TDs were identified using ideal MHD criteria, to within the limits of observational error. Our results add another potential solar wind driver of FBs and imply that FBs may be even more common than previously thought. Key Points A hypothesis about TD-driven FB formation is presented TD-driven FBs are observed and identified © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84947030215&doi=10.1002%2f2015GL065842&partnerID=40&md5=260c2eb30ac60b5aec08fbfc655bc3a9
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8172
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, United States
Recommended Citation:
Liu Z.,Turner D.L.,Angelopoulos V.,et al. THEMIS observations of tangential discontinuity-driven foreshock bubbles[J]. Geophysical Research Letters,2015-01-01,42(19).