DOI: 10.1002/2015GL064915
论文题名: Identification of the dominant ULF wave mode and generation mechanism for obliquely propagating waves in the Earth's foreshock
作者: Strumik M. ; Roytershteyn V. ; Karimabadi H. ; Stasiewicz K. ; Grzesiak M. ; Przepiõrka D.
刊名: Geophysical Research Letters
ISSN: 0094-9278
EISSN: 1944-9009
出版年: 2015
卷: 42, 期: 13 起始页码: 5109
结束页码: 5116
语种: 英语
英文关键词: foreshock
; Plasma instabilities
; Quasi-parallel shock
; ULF waves
Scopus关键词: Earthquakes
; Electromagnetic fields
; Magnetosphere
; Phase space methods
; Plasma diagnostics
; Plasma stability
; Wave propagation
; Wave transmission
; Foreshock
; Interplanetary magnetic fields
; Phase space densities
; Quasi-parallel shock
; Radial configuration
; Realistic environments
; ULF waves
; Ultra low frequencies
; Vector spaces
; foreshock
; geometry
; interplanetary dust
; ion
; magnetic field
; magnetosphere
; planetary atmosphere
; plasma
; reaction kinetics
; spacecraft
; wave propagation
英文摘要: We discuss mechanisms of the generation of ultralow frequency (ULF) upstream waves in the terrestrial foreshock that are essential for the acceleration of ions in space plasmas. The analysis is based on global hybrid kinetic simulations of the magnetosphere that provide realistic environment for the growth of the ULF waves in a quasi-radial configuration of the interplanetary magnetic field. We focus on a long-debated problem of the generation mechanism of oblique and parallel ULF waves and provide quantitative arguments in favor of the ion/ion cyclotron resonant instability. We also show that parallel propagating waves are predominantly generated in this configuration, but geometrical effects related to the phase space density in wave vector space lead to apparent predominance of obliquely propagating waves. Correspondence between the results outlined above and previously published experimental claims is thoroughly discussed and our results are shown to be consistent with spacecraft measurements. Key Points Parallel mode of ULF waves in the Earth's foreshock dominates over oblique mode Oblique mode is generated by oblique branch of the ion-ion resonant instability Kinetic simulations of foreshock ULF waves are consistent with observations. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938213082&doi=10.1002%2f2015GL064915&partnerID=40&md5=39da696bfbea17ceae0125f4c3f4ba67
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8894
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: Space Research Centre, Polish Academy of Sciences, Warsaw, Poland
Recommended Citation:
Strumik M.,Roytershteyn V.,Karimabadi H.,et al. Identification of the dominant ULF wave mode and generation mechanism for obliquely propagating waves in the Earth's foreshock[J]. Geophysical Research Letters,2015-01-01,42(13).