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Conference papers

The role of Alfvén wave dynamics in the large scale properties of the solar wind: comparing 3D MHD simulation and PSP data

Abstract : The first two encounters of Parker Solar Probe have shown features that already challenge our understanding of the solar wind. During E1, PSP went through a slow Alfvénic solar wind, likely coming from equatorial regions. Large amplitude Alfvén waves are present over many frequencies and show a spherical polarization consistent with non-linear solutions of the MHD equations. To study this phenomenon we use 3D MHD simulations of the solar corona, including the propagation and the dissipation of Alfvén waves to power the solar wind. We first check the agreement of the simulations with coronal images obtained from EUV instruments as well as white light images obtained with WISPR onboard PSP. We then can find the sources of the observed solar wind and compare with simpler potential field models (PFSS). Finally, we propose a way to interpret the differences in the properties of the simulations and the observed data, by accounting for the wave dynamics in the large scale (or average) solar wind properties. This could lead to important progress regarding the open flux problem and the computation of the solar wind angular momentum.

This research was supported by NASA Parker Solar Probe Observatory Scientist grant NNX 15AF34G and by the European Research Council (ERC) project SLOW_SOURCE - DLV-819189 .

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https://hal-insu.archives-ouvertes.fr/insu-03562465
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Submitted on : Wednesday, February 9, 2022 - 7:26:35 AM
Last modification on : Monday, July 4, 2022 - 9:50:00 AM

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V. Réville, M. Velli, O. Panasenco, A. Tenerani, C. Shi, et al.. The role of Alfvén wave dynamics in the large scale properties of the solar wind: comparing 3D MHD simulation and PSP data. American Geophysical Union, 2019, San Francisco, United States. 15 pp. ⟨insu-03562465⟩

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