Correlation Between the Magnetic Field and Plasma Parameters at 1 AU
Zicai Yang Fang Shen Jie Zhang Yi Yang Xueshang Feng Ian G. Richardson
Solar Physics
February 2018
February 2018
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, TT , and velocity, VV , and the negative correlation between density, NN , and velocity, VV , are well known. However, the magnetic field intensity, BB , does not appear to be well correlated with any individual plasma parameter. In this article, we discuss previously under-reported correlations between BB and the combined plasma parameters NV2−−−−√NV2 as well as between BB and NT−−−√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.
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, TT , and velocity, VV , and the negative correlation between density, NN , and velocity, VV , are well known. However, the magnetic field intensity, BB , does not appear to be well correlated with any individual plasma parameter. In this article, we discuss previously under-reported correlations between BB and the combined plasma parameters NV2−−−−√NV2 as well as between BB and NT−−−√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
Solar wind Correlation Magnetic fields CIR