What is the Solar Wind Frame of Reference?
What is the Solar Wind Frame of Reference?
复制标题
什么是太阳风参考系？
DOI：
10.3847/1538-4357/ab65f7
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
R. Wimmer–Schweingruber
中科院分区：
文献类型：
--
作者：
Z. Němeček;T. Ďurovcová;J. Šafránková;F. Němec;L. Matteini;D. Stansby;N. Janitzek;L. Berger;R. Wimmer–Schweingruber
各种太阳风离子物种以不同的速度移动，理论上的考虑以及在靠近太阳的区域进行的有限观测表明，重太阳风离子往往比质子流动得更快，至少在年龄较短的快速太阳风流中是这样。太阳风流携带着冻结在行星际的磁场(IMF)，这种情况引发了三个相关的问题：(I)适当的太阳风速度是多少，(Ii)这个速度是否等于主要分量的速度，无论它是什么，以及(Iii)磁场的速度是多少？我们表明，基于MHD近似以及带电粒子在电场和磁场中的动力学的简单理论考虑表明，IMF运动速度(De Hoffmann-Teller(HT)速度)将被认为是适合于太阳风研究的速度。我们基于Wind、Helios、ACE和SOHO观测的太阳风种群差异流的分析表明，它们的能量在HT框架中是守恒的。另一方面，数据的噪声和时间分辨率不允许我们决定总动量在这一帧中是否也是守恒的。
Various solar wind ion species move with different speeds and theoretical considerations as well as limited observations in a region close to the Sun show that heavy solar wind ions tend to flow faster than protons, at least in less-aged fast solar wind streams. The solar wind flow carries the frozen-in interplanetary magnetic field (IMF) and this situation evokes three related questions: (i) what is the proper solar wind speed, (ii) is this speed equal to the speed of the dominant component, whatever that may be, and (iii) what is the speed of the magnetic field? We show that simple theoretical considerations based on the MHD approximation as well as on the dynamics of charged particles in electric and magnetic fields suggest that the IMF velocity of motion (de Hoffmann–Teller (HT) velocity) would be deliberated as the velocity appropriate for solar wind studies. Our analysis based on the Wind, Helios, ACE, and SOHO observations of differential streaming of solar wind populations shows that their energy is conserved in the HT frame. On the other hand, the noise and temporal resolution of the data do not allow us to decide whether the total momentum is also conserved in this frame.
影响因子：
8.6
作者：
L. Berger;R. Wimmer–Schweingruber;G. Gloeckler
通讯作者：
L. Berger;R. Wimmer–Schweingruber;G. Gloeckler