Properties of planetward ion flows in Venus' magnetotail

doi:10.1016/j.icarus.2016.02.053

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	Properties of planetward ion flows in Venus' magnetotail
	Kollmann, P.1; Brandt, P. C.1; Collinson, G.2; Rong, Z. J.4; Futaana, Y.3; Zhang, T. L.5
刊名	ICARUS
	2016-08-01
卷号	274 页码:73-82
关键词	Venus Magnetospheres Reconnection Venus Express Plasma
DOI	10.1016/j.icarus.2016.02.053
文献子类	Article
英文摘要	Venus is gradually losing some of its atmosphere in the form of ions through its induced magnetotail. Some of these ions have been reported previously to flow back to the planet. Proposed drivers are magnetic reconnection and deflection of pickup ions in the magnetic field. We analyze protons and oxygen ions with eV to keV energies acquired by the ASPERA-4/IMA instrument throughout the entire Venus Express mission. We find that venusward flowing ions are important in the sense that their density and deposition rate into the atmosphere is of the same order of magnitude as the density and escape rate of downtail flowing ions. Our analysis shows that during strong EUV irradiance, which occurs during solar maximum, the flux of venusward flowing protons is weaker and of oxygen ions is stronger than during weak irradiance. Since such a behavior was observed when tracing oxygen ions through a MHD model, the ultimate driver of the venusward flowing ions may simply be the magnetic field configuration around Venus. Although the pure downtail oxygen flux stays mostly unchanged for all observed EUV conditions, the increase in venusward oxygen flux for high irradiance results in a lower net atmospheric escape rate. Venusward bulk flows are mostly found in locations where the magnetic field is weak relative to the interplanetary conditions. Although a weak field is generally an indicator of proximity to the magnetotail current sheet, these flows do not cluster around current sheet crossings, as one may expect if they would be driven by magnetic reconnection. (C) 2016 The Authors. Published by Elsevier Inc.
WOS关键词	EXPRESS OBSERVATIONS ; MAGNETIC-FIELD ; SOLAR-WIND ; PLASMA ENVIRONMENT ; FLAPPING MOTIONS ; MARS-EXPRESS ; ESCAPE RATE ; PRECIPITATION ; DISTRIBUTIONS ; CONSEQUENCES
WOS研究方向	Astronomy & Astrophysics
语种	英语
WOS记录号	WOS:000375885700006
资助机构	NASA(NNX10AI17G) ; NASA(NNX10AI17G) ; NASA(NNX10AI17G) ; NASA(NNX10AI17G)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53524]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
作者单位	1.Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20723 USA 2.NASA, Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD 20771 USA 3.Swedish Inst Space Phys IRF, S-98128 Kiruna, Sweden 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China 5.Austrian Acad Sci, Space Res Inst IWF, A-8042 Graz, Austria
推荐引用方式 GB/T 7714	Kollmann, P.,Brandt, P. C.,Collinson, G.,et al. Properties of planetward ion flows in Venus' magnetotail[J]. ICARUS,2016,274:73-82.
APA	Kollmann, P.,Brandt, P. C.,Collinson, G.,Rong, Z. J.,Futaana, Y.,&Zhang, T. L..(2016).Properties of planetward ion flows in Venus' magnetotail.ICARUS,274,73-82.
MLA	Kollmann, P.,et al."Properties of planetward ion flows in Venus' magnetotail".ICARUS 274(2016):73-82.