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Solar Physics

, 293:24 | Cite as

Correlation Between the Magnetic Field and Plasma Parameters at 1 AU

  • Zicai Yang
  • Fang Shen
  • Jie Zhang
  • Yi Yang
  • Xueshang Feng
  • Ian G. Richardson
Earth-affecting Solar Transients
Part of the following topical collections:
  1. Earth-affecting Solar Transients

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.

Keywords

Solar wind Correlation Magnetic fields CIR 

Notes

Acknowledgements

We acknowledge the use of solar wind data obtained from the GSFC/SPDF OMNI Web interface at http://omniweb.gsfc.nasa.gov . This work is jointly supported by grants from the National Natural Science Foundation of China (41474152, 41531073 and 41774184), and the Specialized Research Fund for State Key Laboratories. FS is also supported by the National Program for Support of Top-notch Young Professionals. JZ is supported by NSF AGS-1249270 and AGS-1460188. IGR acknowledges support from the ACE project. We are also grateful to the anonymous reviewer for the constructive and helpful comments.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  • Zicai Yang
    • 1
    • 2
  • Fang Shen
    • 1
    • 2
    • 3
  • Jie Zhang
    • 4
  • Yi Yang
    • 1
    • 2
  • Xueshang Feng
    • 1
    • 3
  • Ian G. Richardson
    • 5
    • 6
  1. 1.SIGMA Weather Group, State Key Laboratory of Space Weather, National Space Science CenterChinese Academy of SciencesBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.HIT Institute of Space Science and Applied TechnologyShenzhenChina
  4. 4.Department of Physics and AstronomyGeorge Mason UniversityFairfaxUSA
  5. 5.GPHI and Department of AstronomyUniversity of MarylandCollege ParkUSA
  6. 6.NASA Goddard Space Flight CenterGreenbeltUSA

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