Correlation Between the Magnetic Field and Plasma Parameters at 1 AU |
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| Authors: | Zicai Yang Fang Shen Jie Zhang Yi Yang Xueshang Feng Ian G Richardson |
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| Institution: | 1.SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science Center,Chinese Academy of Sciences,Beijing,China;2.University of Chinese Academy of Sciences,Beijing,China;3.HIT Institute of Space Science and Applied Technology,Shenzhen,China;4.Department of Physics and Astronomy,George Mason University,Fairfax,USA;5.GPHI and Department of Astronomy,University of Maryland,College Park,USA;6.NASA Goddard Space Flight Center,Greenbelt,USA |
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| Abstract: | The physical parameters of the solar wind observed in-situ near 1 AU have been studied for several decades, and relationships between them, such as the positive correlation between the solar wind plasma temperature, \(T\), and velocity, \(V\), and the negative correlation between density, \(N\), and velocity, \(V\), are well known. However, the magnetic field intensity, \(B\), does not appear to be well correlated with any individual plasma parameter. In this article, we discuss previously under-reported correlations between \(B\) and the combined plasma parameters \(\sqrt{N V^{2}} \) as well as between \(B\) and \(\sqrt{NT}\). These two correlations are strong during periods of corotating interaction regions and high-speed streams, and moderate during intervals of slow solar wind. The results indicate that the magnetic pressure in the solar wind is well correlated both with the plasma dynamic pressure and the thermal pressure. |
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