Testing the Linearity of Vector Fields in Cold and Dense Space Plasmas
文献类型：期刊论文
| 作者 | Liu,Y. Y.3,4; Wang,Z.3,4; Chen,G.1,2; Yu,Y.3,4; Guo,Z. Z.3,4; Xiong,X.3,4 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2022-04-01 |
| 卷号 | 929期号:2 |
| 关键词 | Space plasmas Astronomy data analysis Magnetohydrodynamics Solar wind |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ac5d4b |
| 英文摘要 | Abstract Linearization of the vector field, as a common multispacecraft data analysis technique, has been widely used in (1) reconstruction of three-dimensional magnetic and velocity fields, (2) predictions of the possible topologies of linear fields, especially for the magnetic null-point classification, and (3) other data analysis techniques, such as the curlometer technique. However, the length scale of validity of the linear approximation in space plasmas is still an open question. In this study, we utilize the frozen-in condition as the criterion to estimate the accuracy of the linear method. We derive the linearization error theoretically, and find that the frozen-in condition cannot be satisfied everywhere in the linearly reconstructed fields as long as the fields have nonzero spatial gradients. This indicates that the use of the linear method must be treated with caution. We further investigate the length scale of validity of the linear method in space plasmas by utilizing the Magnetospheric Multiscale Mission data. Through two case studies and statistical analysis, we demonstrate that the linear approximation is acceptable at a length scale of, on average, 1.1 ion inertial lengths in the solar wind/magnetosheath, while in the magnetosphere the linear method exhibits great uncertainties. This study provides the theoretical basis for the application of the linear method in space plasmas. |
| 语种 | 英语 |
| WOS记录号 | IOP:APJ_929_2_155 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102963]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 通讯作者 | Liu,Y. Y. |
| 作者单位 | 1.Institutions of Earth Science, Chinese Academy of Sciences, Beijing, People’s Republic of China 2.Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Beijing, People’s Republic of China 3.Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology, Beijing, People’s Republic of China 4.School of Space and Environment, Beihang University, Beijing, People’s Republic of China; liuyy_sp@buaa.edu.cn |
| 推荐引用方式 GB/T 7714 | Liu,Y. Y.,Wang,Z.,Chen,G.,et al. Testing the Linearity of Vector Fields in Cold and Dense Space Plasmas[J]. The Astrophysical Journal,2022,929(2). |
| APA | Liu,Y. Y.,Wang,Z.,Chen,G.,Yu,Y.,Guo,Z. Z.,&Xiong,X..(2022).Testing the Linearity of Vector Fields in Cold and Dense Space Plasmas.The Astrophysical Journal,929(2). |
| MLA | Liu,Y. Y.,et al."Testing the Linearity of Vector Fields in Cold and Dense Space Plasmas".The Astrophysical Journal 929.2(2022). |
入库方式： OAI收割
来源：地质与地球物理研究所
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