DOI: 10.1029/2012GL054330
论文题名: Resonant diffusion of energetic electrons by narrowband Z mode waves in Saturn's inner magnetosphere
作者: Gu X. ; Thorne R.M. ; Ni B. ; Ye S.-Y.
刊名: Geophysical Research Letters
ISSN: 0094-9382
EISSN: 1944-9113
出版年: 2013
卷: 40, 期: 2 起始页码: 255
结束页码: 261
语种: 英语
Scopus关键词: Electron gyrofrequency
; Energetic electron
; Field informations
; Inner magnetosphere
; Plasma frequencies
; Radiation belt electrons
; Radio and plasma wave science
; Resonant scattering
; Electron scattering
; Plasma waves
; Power spectral density
; Radiation belts
; Diffusion
; acceleration
; diffusion
; electron
; frequency-magnitude distribution
; Gaussian method
; inner core
; magnetic field
; magnetosphere
; Saturn
; spectral analysis
英文摘要: Banded emissions near 5 and 20 kHz are observed by the Cassini Radio and Plasma Wave Science (RPWS) instrument and are identified as Z mode waves in the regions where the plasma frequency is below the electron gyrofrequency. Using wave parameters derived from Gaussian fits to the measured power spectral density for narrow-band Z mode waves and the ambient density and magnetic field information at L = ∼4, we compute the bounce-averaged diffusion coefficients for the Saturnian radiation belt electrons. Our results indicate that 5 kHz Z mode emissions can cause resonant scattering of electrons from ∼2 MeV to tens of megaelectron volts, while 20 kHz waves can interact with electrons from hundreds of kiloelectron volts to ∼2 MeV. In principle, the rate of momentum diffusion can be an order of magnitude larger than that of pitch angle diffusion and cross diffusion for electrons at equatorial pitch angles>∼10°, suggesting that Z mode waves on Saturn are responsible for local acceleration of radiation belt energetic electrons at intermediate pitch angles. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874848171&doi=10.1029%2f2012GL054330&partnerID=40&md5=e3a9988dda4774fec16dbee6ec652183
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6646
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States
Recommended Citation:
Gu X.,Thorne R.M.,Ni B.,et al. Resonant diffusion of energetic electrons by narrowband Z mode waves in Saturn's inner magnetosphere[J]. Geophysical Research Letters,2013-01-01,40(2).