Modeling proton and electron heating in the fast solar wind
Modeling proton and electron heating in the fast solar wind
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DOI：
10.1051/0004-6361/202039297
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发表时间：
2020-11
影响因子：
6.5
通讯作者：
L. Adhikari;G. Zank;L.-L. Zhao-L.;M. Nakanotani;S. Tasnim
中科院分区：
文献类型：
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作者：
L. Adhikari;G. Zank;L.-L. Zhao-L.;M. Nakanotani;S. Tasnim
上下文。帕克太阳探测器（PSP）测量太阳附近的太阳风质子和电子。为了研究电子和质子的热力学性质，我们考虑了电子效应，如质子和电子之间的分布湍流加热，质子和电子之间的库仑碰撞以及电子的热传导。目标。我们建立了一个几乎不可压缩磁流体动力学（NI MHD）湍流的一般理论模型，并结合了一个包含电子压力和热通量的太阳风模型。方法。值得注意的是，60%的湍流能量分配给质子加热，40%分配给电子加热。我们用经验表达式来表示电子热流。我们导出了一个包含alfv<s:1>效应和湍流小尺度发电机效应的剩余能量的非线性耗散项。同样，我们在NI MHD现象学中获得了NI/slab时间尺度，用于推导包含alfvsamn效应的非线性项。结果。将理论模型解与PSP和Helios 2测量的快速太阳风进行了详细的比较，结果表明它们是一致的。结果表明，近不可压缩的NI/slab湍流分量描述了太阳风流与磁场对齐或反对齐时的快速太阳风期观测。
Context. The Parker Solar Probe (PSP) measures solar wind protons and electrons near the Sun. To study the thermodynamic properties of electrons and protons, we include electron effects, such as distributed turbulent heating between protons and electrons, Coulomb collisions between protons and electrons, and heat conduction of electrons. Aims. We develop a general theoretical model of nearly incompressible magnetohydrodynamic (NI MHD) turbulence coupled with a solar wind model that includes electron pressure and heat flux. Methods. It is important to note that 60% of the turbulence energy is assigned to proton heating and 40% to electron heating. We use an empirical expression for the electron heat flux. We derived a nonlinear dissipation term for the residual energy that includes both the Alfvén effect and the turbulent small-scale dynamo effect. Similarly, we obtained the NI/slab time-scale in an NI MHD phenomenology to use in the derivation of the nonlinear term that incorporates the Alfvén effect. Results. A detailed comparison between the theoretical model solutions and the fast solar wind measured by PSP and Helios 2 shows that they are consistent. The results show that the nearly incompressible NI/slab turbulence component describes observations of the fast solar wind periods when the solar wind flow is aligned or antialigned with the magnetic field.