VLBI Data Processing on Coronal Radio-sounding Experiments of Mars Express
文献类型：期刊论文
| 作者 | Ma,Maoli9,10; Calvés,Guifré Molera8; Cimò,Giuseppe7; Zhang,Peijin6; Xiong,Ming5; Li,Peijia10; Kummamuru,Pradyumna8; Chu,Zhanghu10; Jiang,Tianyu10; Xia,Bo10 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 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. |
| WOS关键词 | SOLAR-WIND TURBULENCE ; FREQUENCY FLUCTUATIONS ; PHASE SCINTILLATION ; MASS EJECTION ; VELOCITY ; DENSITY ; ULYSSES ; PLASMA ; ACCELERATION ; CONJUNCTIONS |
| 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研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-6256-162-4-AC0DC1 |
| 出版者 | The American Astronomical Society |
| 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 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/4234]  |
| 专题 | 25米望远镜运行组 射电天文研究室_利用南山26米射电望远镜观测数据的文章 |
| 通讯作者 | Ma,Maoli |
| 作者单位 | 1.National Basic Science Data Center, Building No.2, 4, Zhongguancun South 4th Street, Haidian District, Beijing 100190, People’s Republic of China 2.Xinjiang Astronomical Observatory, CAS 150 Science 1-Street, Urumqi, People’s Republic of China 3.Hartebeesthoek Radio Astronomy Observatory, P.O. Box 443, Krugersdorp, South Africa 4.Centro de Desarrollos Tecnológicos, Observatorio de Yebes, Guadalajara, Spain 5.National Space Science Center, NO.1 Nanertiao, Zhongguancun, Haidian District, Beijing, People’s Republic of China 6.University of Science and Technology of China, 96 Jinzhai Road, Hefei, People’s Republic of China 7.Joint Institute for VLBI ERIC, Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands 8.University of Tasmania, Private Bag 37, Hobart TAS 7001, Australia 9.Shanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 10 Yuanhua Road, Nanjing, Jiangsu 210033, People’s Republic of China 10.Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai, 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. |
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