Magnetic fields in the Mars ionosphere of a noncrustal origin: Magnetization features

doi:10.1002/2014GL061453

	Magnetic fields in the Mars ionosphere of a noncrustal origin: Magnetization features
	Dubinin, E.1; Fraenz, M.1; Zhang, T. L.2; Woch, J.1; Wei, Y.3
刊名	GEOPHYSICAL RESEARCH LETTERS
	2014-09-28
卷号	41 期号:18 页码:6329-6334
ISSN号	0094-8276
DOI	10.1002/2014GL061453
文献子类	Article
英文摘要	The magnetic field observations by the Mars Global Surveyor (MGS) performed on the premapping orbits in the years 1997 and 1998 in the low-altitude ionosphere of Mars show the existence of a strong "external" magnetization not related to the "internal" crustal magnetization. A significant increase of the magnetic field strength is observed in the collisional northern ionosphere at altitudes of similar to 200 km and at 60 degrees-90 degrees solar zenith angles sampled by MGS. The magnetization features and the magnetic field topology vary significantly with the sector structure of the interplanetary magnetic field (IMF). For B-yIMF > 0 the magnetic flux tubes transported to altitudes of similar to 200 km are suddenly straightened releasing their tangential stresses. For B-yIMF < 0 a rotation of the magnetic field vector by almost 180. occurs. Such an asymmetry in the ionospheric response on Mars is similar to the asymmetry observed on Venus at the periods of low-solar activity indicating its universal origin for magnetized ionospheres. It is suggested that the electric currents generated in the collisional ionosphere where the ions become demagnetized, while the electrons remain magnetized produce the observed features.
WOS关键词	VENUS IONOSPHERE ; SOLAR-WIND ; MODEL ; EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000344913700004
资助机构	German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; German Science Foundation (DFG)(WO910/3-1) ; German Science Foundation (DFG)(WO910/3-1) ; German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; German Science Foundation (DFG)(WO910/3-1) ; German Science Foundation (DFG)(WO910/3-1) ; German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; German Science Foundation (DFG)(WO910/3-1) ; German Science Foundation (DFG)(WO910/3-1) ; German Aerospace Agency (DLR)(50QM0801) ; German Aerospace Agency (DLR)(50QM0801) ; German Science Foundation (DFG)(WO910/3-1) ; German Science Foundation (DFG)(WO910/3-1)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85324]
专题	中国科学院地质与地球物理研究所
通讯作者	Dubinin, E.
作者单位	1.Max Planck Inst Solar Syst Res, Gottingen, Germany 2.Austrian Acad Sci, Space Res Inst, A-8010 Graz, Austria 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Dubinin, E.,Fraenz, M.,Zhang, T. L.,et al. Magnetic fields in the Mars ionosphere of a noncrustal origin: Magnetization features[J]. GEOPHYSICAL RESEARCH LETTERS,2014,41(18):6329-6334.
APA	Dubinin, E.,Fraenz, M.,Zhang, T. L.,Woch, J.,&Wei, Y..(2014).Magnetic fields in the Mars ionosphere of a noncrustal origin: Magnetization features.GEOPHYSICAL RESEARCH LETTERS,41(18),6329-6334.
MLA	Dubinin, E.,et al."Magnetic fields in the Mars ionosphere of a noncrustal origin: Magnetization features".GEOPHYSICAL RESEARCH LETTERS 41.18(2014):6329-6334.