The electron thermal structure in the dayside Martian ionosphere implied by the MGS radio occultation data

	The electron thermal structure in the dayside Martian ionosphere implied by the MGS radio occultation data
	Cui, J.1; Galand, M.2; Zhang, S. J.3; Vigren, E.4; Zou, H.5
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
	2015-02-01
卷号	120 期号:2 页码:278-286
关键词	Martian ionosphere Chapman theory electron temperature
英文摘要	We propose a revised Chapman model for the ionosphere of Mars by allowing for vertical variation of electron temperature. An approximate energy balance between solar EUV heating and CO2 collisional cooling is applied in the dayside Martian ionosphere, analogous to the method recently proposed by Withers et al. (2014). The essence of the model is to separate the contributions of the neutral and electron thermal structures to the apparent width of the main ionospheric layer. Application of the model to the electron density profiles from the Mars Global Surveyor (MGS) radio occultation measurements reveals a clear trend of elevated electron temperature with increasing solar zenith angle (SZA). It also reveals that the characteristic length scale for the change of electron temperature with altitude decreases with increasing SZA. These observations may imply enhanced topside heat influx near the terminator, presumably an outcome of the solar wind interactions with the Martian upper atmosphere. Our analysis also reveals a tentative asymmetry in electron temperature between the northern and southern hemispheres, consistent with the scenario of elevated electron temperature within minimagnetospheres.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geochemistry & Geophysics
研究领域[WOS]	Geochemistry & Geophysics
关键词[WOS]	MARS GLOBAL SURVEYOR ; DENSITY PROFILES ANALYSIS ; MAGNETIC-FIELD ; MONOCHROMATIC RADIATION ; UPPER-ATMOSPHERE ; ROTATING EARTH ; ABSORPTION ; EXPRESS ; TEMPERATURES ; MODEL
收录类别	SCI
语种	英语
WOS记录号	WOS:000351363300008
公开日期	2015-08-18
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/18223]
专题	上海天文台_天文地球动力学研究中心
作者单位	1.Chinese Acad Sci, Key Lab Lunar & Deep Space Explorat, Beijing, Peoples R China 2.Univ London Imperial Coll Sci Technol & Med, Dept Phys, London, England 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai, Peoples R China 4.Swedish Inst Space Phys, Uppsala, Sweden 5.Beijing Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Cui, J.,Galand, M.,Zhang, S. J.,et al. The electron thermal structure in the dayside Martian ionosphere implied by the MGS radio occultation data[J]. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,2015,120(2):278-286.
APA	Cui, J.,Galand, M.,Zhang, S. J.,Vigren, E.,&Zou, H..(2015).The electron thermal structure in the dayside Martian ionosphere implied by the MGS radio occultation data.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,120(2),278-286.
MLA	Cui, J.,et al."The electron thermal structure in the dayside Martian ionosphere implied by the MGS radio occultation data".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 120.2(2015):278-286.