VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express

doi:10.3847/1538-3881/ac0dc1

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	VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express
	Ma,Maoli 1,2; Calvés,Guifré Molera 3; Cimò,Giuseppe 4; Zhang,Peijin 5; Xiong,Ming 6; Li,Peijia 1; Kummamuru,Pradyumna 3; Chu,Zhanghu 1; Jiang,Tianyu 1; Xia,Bo 1
刊名	The Astronomical Journal
	2021-09-14
卷号	162 期号:4 页码:13
关键词	Solar wind Very long baseline interferometry Deep space probes
ISSN号	0004-6256
DOI	10.3847/1538-3881/ac0dc1
通讯作者	Ma,Maoli()
英文摘要	Abstract The ESA’s Mars Express solar corona experiments were performed at two solar conjunctions in the years 2015 and 2017 by a number of radio telescopes in the European VLBI Network. This paper presents the methods to measure the frequency and phase fluctuations of the spacecraft radio signal, and the applications to study the characteristics of the plasma turbulence effects on the signal at a single station and at multiple stations via cross correlation. The power spectra of the frequency fluctuations observed between 4.9 and 76.3 Rs have a power-law shape close to a Kolmogorov spectrum over the frequency interval νlo < ν < νup, where the nominal value of νlo is set to 3 mHz and νup is in the range of 0.03–0.15 Hz. The rms of the frequency fluctuations is presented as a function of the heliocentric distance. Furthermore, we analyze the variations of the electron column density fluctuations at solar offsets 4.9 Rs and 9.9 Rs and the cross-correlation products between the VLBI stations. The power density of the differential fluctuations between different stations decreases at ν < 0.01 Hz. Finally, the fast flow speeds of solar wind >700 km s?1 are derived from the cross correlation of frequency fluctuations at ν < 0.01 Hz. The fast flow speeds of solar wind correspond to the high heliolatitude of the coronal region that the radio rays passed. The VLBI observations and analysis methods can be used to study the electron column density fluctuations and the turbulence at multiple spatial points in the inner solar wind by providing multiple lines of sight between the Earth and the spacecraft.
资助项目	National Natural Science Foundation of China[11703070] ; National Natural Science Foundation of China[U1831137] ; National Natural Science Foundation of China[U1931135] ; National Natural Science Foundation of China[11903067] ; National Natural Science Foundation of China[11803070] ; National R&D Infrastructure and Facility Development Program of China, Fundamental Science Data Sharing Platform[DKA 2017-12-02-09] ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration[D020303]
WOS关键词	SOLAR-WIND TURBULENCE ; FREQUENCY FLUCTUATIONS ; PHASE SCINTILLATION ; MASS EJECTION ; VELOCITY ; DENSITY ; ULYSSES ; PLASMA ; ACCELERATION ; CONJUNCTIONS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-6256-162-4-AC0DC1
资助机构	National Natural Science Foundation of China ; National R&D Infrastructure and Facility Development Program of China, Fundamental Science Data Sharing Platform ; Pre-research Project on Civil Aerospace Technologies - China National Space Administration
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4234]
专题	25米望远镜运行组
通讯作者	Ma,Maoli
作者单位	1.Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai, People’s Republic of China 2.Shanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 10 Yuanhua Road, Nanjing, Jiangsu 210033, People’s Republic of China 3.University of Tasmania, Private Bag 37, Hobart TAS 7001, Australia 4.Joint Institute for VLBI ERIC, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands 5.University of Science and Technology of China, 96 Jinzhai Road, Hefei, People’s Republic of China 6.National Space Science Center, NO.1 Nanertiao, Zhongguancun, Haidian District, Beijing, People’s Republic of China 7.Centro de Desarrollos Tecnológicos, Observatorio de Yebes, Guadalajara, Spain 8.Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp, South Africa 9.Xinjiang Astronomical Observatory, CAS 150 Science 1-Street, Urumqi, People’s Republic of China 10.National Basic Science Data Center, Building No.2, 4, Zhongguancun South 4th Street, Haidian District, Beijing 100190, People’s Republic of China
推荐引用方式 GB/T 7714	Ma,Maoli,Calvés,Guifré Molera,Cimò,Giuseppe,et al. VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express[J]. The Astronomical Journal,2021,162(4):13.
APA	Ma,Maoli.,Calvés,Guifré Molera.,Cimò,Giuseppe.,Zhang,Peijin.,Xiong,Ming.,...&Chen,Zhong.(2021).VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express.The Astronomical Journal,162(4),13.
MLA	Ma,Maoli,et al."VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express".The Astronomical Journal 162.4(2021):13.