DOI: 10.1002/2014GL062406
论文题名: Trapping and acceleration of upflowing ionospheric electrons in the magnetosphere by electrostatic electron cyclotron harmonic waves
作者: Horne R.B.
刊名: Geophysical Research Letters
ISSN: 0094-8953
EISSN: 1944-8684
出版年: 2015
卷: 42, 期: 4 起始页码: 975
结束页码: 980
语种: 英语
英文关键词: acceleration
; ECH waves
; trapping
Scopus关键词: Acceleration
; Cyclotrons
; Diffusion
; Electrostatics
; Ionosphere
; Ionospheric measurement
; Magnetosphere
; Radiation belts
; Rockets
; Doppler-shifted cyclotron resonance
; Electron cyclotron harmonic
; Electron cyclotron harmonic waves
; Field-aligned electrons
; Magnetosphere-ionosphere coupling
; Pitch angle distribution
; Quasi-linear diffusion theory
; Trapping
; Electrons
; acceleration
; adiabatic process
; diffusion
; Doppler effect
; electron
; experimental apparatus
; geomagnetic field
; harmonic analysis
; ionosphere
; magnetosphere
; resonance
英文摘要: During geomagnetically active conditions upflowing field-aligned electrons which form part of the Birkland current system have been observed at energies of up to 100 eV. If the first adiabatic invariant is conserved, these electrons would reach the conjugate ionosphere without trapping in the magnetosphere. Here we show, by using quasi-linear diffusion theory, that electrostatic electron cyclotron harmonic (ECH) waves can diffuse these low-energy electrons in pitch angle via Doppler-shifted cyclotron resonance and trap them in the magnetosphere. We show that energy diffusion is comparable to pitch angle diffusion up to energies of a few keV. We suggest that ECH waves trap ionospheric electrons in the magnetosphere and accelerate them to produce butterfly pitch angle distributions at energies of up to a few keV. We suggest that ECH waves play a role in magnetosphere-ionosphere coupling and help provide the source electron population for the radiation belts. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84924916469&doi=10.1002%2f2014GL062406&partnerID=40&md5=5260ae23b8280d18d1d4d7cc2e09eb56
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8569
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: British Antarctic Survey, Cambridge, United Kingdom
Recommended Citation:
Horne R.B.. Trapping and acceleration of upflowing ionospheric electrons in the magnetosphere by electrostatic electron cyclotron harmonic waves[J]. Geophysical Research Letters,2015-01-01,42(4).