Volume 650, June 2021
Parker Solar Probe: Ushering a new frontier in space exploration
|Number of page(s)||10|
|Section||The Sun and the Heliosphere|
|Published online||02 June 2021|
Modeling proton and electron heating in the fast solar wind
Center for Space Plasma and Aeronomic Research (CSPAR), University of Alabama in Huntsville,
2 Department of Space Science, University of Alabama in Huntsville, Huntsville, AL 35899, USA
Accepted: 1 October 2020
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.
Key words: magnetohydrodynamics (MHD) / turbulence / waves
© ESO 2021
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