Fast acceleration of inner magnetospheric hydrogen and oxygen ions by   shock induced ULF waves

doi:10.1029/2012JA018024

CORC > 北京大学 > 地球与空间科学学院

	Fast acceleration of inner magnetospheric hydrogen and oxygen ions by shock induced ULF waves
	Zong, Q.G. ; Wang, Y. F. ; Zhang, H. ; Fu, S. Y. ; Zhang, H. ; Wang, C. R. ; Yuan, C. J. ; Vogiatzis, I.
刊名	journal of geophysical research space physics
	2012
关键词	FREQUENCY GEOMAGNETIC-PULSATIONS STORM SUDDEN COMMENCEMENTS CHARGED-PARTICLE BEHAVIOR ELECTRON-SCATTERING LOSS RADIATION BELT SOLAR-WIND RELATIVISTIC ELECTRONS MAGNETIC-FIELD INTERPLANETARY SHOCK DRIFT ECHOES
DOI	10.1029/2012JA018024
英文摘要	The interaction between interplanetary shocks and the Earth's magnetosphere manifests in many important space physics phenomena including particle acceleration. We investigated the response of the inner magnetospheric hydrogen and oxygen ions to a strong interplanetary shock impinging on the Earth's magnetosphere. Both hydrogen and oxygen ions are found to be heated/accelerated significantly with their temperature enhanced by a factor of two and three immediately after similar to 1 min and similar to 12 min of the shock arrival respectively. Multiple energy dispersion signatures of ions were found in the parallel and anti-parallel direction to the magnetic field immediately after the interplanetary shock impact. The energy dispersions in the anti-parallel direction preceded those in the parallel direction. Multiple dispersion signatures can be explained by the flux modulations of local ions (rather than the ions from the Earth's ionosphere) by ULF waves. It is found that the energy spectrum from 10 eV to similar to 40 keV are highly correlated with the cross product of observed ULF wave electric and magnetic field (V = (E x B)/B-2), which indicate that both cold plasmaspheric plasma and hot thermal ions (10 eV to similar to 40 keV) are accelerated and decelerated with the various phases of ULF wave electric field. We then demonstrate that ion acceleration due to the interplanetary shock compression on the Earth's magnetic field is rather limited, whereas the major contribution to acceleration comes from the electric field carried by ULF waves via drift-bounce resonance for both the hydrogen and oxygen ions. The integrated hydrogen and oxygen ion flux with the poloidal mode ULF waves are highly coherent (>0.9) whereas the coherence with the toroidal mode ULF waves is negligible, implying that the poloidal mode ULF waves are much more efficient in accelerating hydrogen and oxygen ions in the inner magnetosphere than the toroidal mode ULF waves. The duration of high coherence for oxygen ions with the poloidal mode ULF wave is longer than that for hydrogen ions, indicating that oxygen ions can be heated/accelerated more efficiently by the poloidal mode ULF wave induced by the interplanetary shock.; Astronomy & Astrophysics; SCI(E); 5; ARTICLE; 117
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/148352]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zong, Q.G.,Wang, Y. F.,Zhang, H.,et al. Fast acceleration of inner magnetospheric hydrogen and oxygen ions by shock induced ULF waves[J]. journal of geophysical research space physics,2012.
APA	Zong, Q.G..,Wang, Y. F..,Zhang, H..,Fu, S. Y..,Zhang, H..,...&Vogiatzis, I..(2012).Fast acceleration of inner magnetospheric hydrogen and oxygen ions by shock induced ULF waves.journal of geophysical research space physics.
MLA	Zong, Q.G.,et al."Fast acceleration of inner magnetospheric hydrogen and oxygen ions by shock induced ULF waves".journal of geophysical research space physics (2012).