Resonant scattering of energetic electrons in the plasmasphere by   monotonic whistler-mode waves artificially generated by ionospheric   modification

doi:10.5194/angeo-32-507-2014

CORC > 北京大学 > 地球与空间科学学院

	Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification
	Chang, S. S. ; Ni, B. B. ; Bortnik, J. ; Zhou, C. ; Zhao, Z. Y. ; Li, J. X. ; Gu, X. D.
刊名	annales geophysicae
	2014
关键词	Space plasma physics wave-particle interactions RADIATION BELT ELECTRONS FAST MAGNETOSONIC WAVES TEMPORAL SIGNATURES ELF RADIATION PRECIPITATION DIFFUSION EMISSIONS SIGNALS FACILITY HEATER
DOI	10.5194/angeo-32-507-2014
英文摘要	Modulated high-frequency (HF) heating of the ionosphere provides a feasible means of artificially generating extremely low-frequency (ELF)/very low-frequency (VLF) whistler waves, which can leak into the inner magnetosphere and contribute to resonant interactions with highenergy electrons in the plasmasphere. By ray tracing the magnetospheric propagation of ELF/VLF emissions artificially generated at low-invariant latitudes, we evaluate the relativistic electron resonant energies along the ray paths and show that propagating artificial ELF/VLF waves can resonate with electrons from similar to 100 keV to similar to 10MeV. We further implement test particle simulations to investigate the effects of resonant scattering of energetic electrons due to triggered monotonic/single-frequency ELF/VLF waves. The results indicate that within the period of a resonance timescale, changes in electron pitch angle and kinetic energy are stochastic, and the overall effect is cumulative, that is, the changes averaged over all test electrons increase monotonically with time. The localized rates of wave-induced pitch-angle scattering and momentum diffusion in the plasmasphere are analyzed in detail for artificially generated ELF/VLF whistlers with an observable in situ amplitude of similar to 10 pT. While the local momentum diffusion of relativistic electrons is small, with a rate of <10(-7) s(-1), the local pitch-angle scattering can be intense near the loss cone with a rate of similar to 10(-4) s(-1). Our investigation further supports the feasibility of artificial triggering of ELF/VLF whistler waves for removal of high-energy electrons at lower L shells within the plasmasphere. Moreover, our test particle simulation results show quantitatively good agreement with quasi-linear diffusion coefficients, confirming the applicability of both methods to evaluate the resonant diffusion effect of artificial generated ELF/VLF whistlers.; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences; SCI(E); 0; ARTICLE; whu.css1108@gmail.com; 5; 507-518; 32
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/390568]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Chang, S. S.,Ni, B. B.,Bortnik, J.,et al. Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification[J]. annales geophysicae,2014.
APA	Chang, S. S..,Ni, B. B..,Bortnik, J..,Zhou, C..,Zhao, Z. Y..,...&Gu, X. D..(2014).Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification.annales geophysicae.
MLA	Chang, S. S.,et al."Resonant scattering of energetic electrons in the plasmasphere by monotonic whistler-mode waves artificially generated by ionospheric modification".annales geophysicae (2014).