气候变化领域集成服务门户(CCPortal): A Survey of Photoelectrons on the Nightside of Mars

CCPortal

DOI	10.1029/2020GL089998
	A Survey of Photoelectrons on the Nightside of Mars
	Cao Y.T.; Cui J.; Wu X.S.; Niu D.D.; Lai H.R.; Ni B.B.; Luo Q.; Yu J.; Wei Y.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
英文摘要	Despite produced exclusively on the dayside, photoelectrons, as an important population of the Martian ionosphere, have also been observed on the nightside. Here we present a statistical survey of nightside photoelectrons using the suprathermal electron measurements, made by the Solar Wind Electron Analyzer onboard the Mars Atmosphere and Volatile Evolution. We find that nearly 30% of the available nightside suprathermal electron spectra show clear photoelectron signatures. Nightside photoelectrons have an occurrence rate that decreases with increasing solar zenith angle and they are characterized by a preferentially field-aligned pitch angle distribution. Our analysis also suggests that nightside photoelectrons are less likely observed under the high solar wind condition. These observations are favorably interpreted by the scenario of photoelectron transport along cross-terminator magnetic field lines, as supported by a simplified test particle model. Our study highlights a complex plasma environment near Mars modulated by both internal and external conditions. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Ionosphere; Photoelectrons; Photons; Solar wind; Surveys; External conditions; Magnetic field line; Martian ionosphere; Photoelectron transport; Pitch angle distribution; Statistical survey; Suprathermal electrons; Volatile evolution; Photoelectron spectroscopy
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169174
作者单位	School of Atmospheric Sciences, Sun Yat-sen University, Zhuhai, Guangdong, China; Center for Excellence in Comparative Planetology, Chinese Academy of Sciences, Hefei, Anhui, China; National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China; Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen, Guangdong, China; Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan, Hubei, China; Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
推荐引用方式 GB/T 7714	Cao Y.T.,Cui J.,Wu X.S.,et al. A Survey of Photoelectrons on the Nightside of Mars[J],2021,48(2).
APA	Cao Y.T..,Cui J..,Wu X.S..,Niu D.D..,Lai H.R..,...&Wei Y..(2021).A Survey of Photoelectrons on the Nightside of Mars.Geophysical Research Letters,48(2).
MLA	Cao Y.T.,et al."A Survey of Photoelectrons on the Nightside of Mars".Geophysical Research Letters 48.2(2021).