First polar observations of the fast solar wind with the Metis - Solar Orbiter 
coronagraph: Role of 2D turbulence energy dissipation in the wind acceleration

Telloni, D.; Antonucci, E.; Adhikari, L.; Zank, G. P.; Giordano, S.; Vai, M.; Zhao, L.-L.; Andretta, V.; Burtovoi, A.; Capuano, G. E.; Da Deppo, V.; De Leo, Y.; Fineschi, S.; Grimani, C.; Heinzel, P.; Jerse, G.; Landini, F.; Liberatore, A.; Moses, J. D.; Naletto, G.; Nicolini, G.; Pancrazzi, M.; Romoli, M.; Russano, G.; Sasso, C.; Slemer, A.; Spadaro, D.; Stangalini, M.; Susino, R.; Teriaca, L.; Uslenghi, M.; Sorriso-Valvo, L.; Marino, R.; Perrone, D.; D'Amicis, R.; Bruno, R.

doi:10.1051/0004-6361/202245759

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First polar observations of the fast solar wind with the Metis - Solar Orbiter coronagraph: Role of 2D turbulence energy dissipation in the wind acceleration

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De Leo, Y.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
IMPRS for Solar System Science at the University of Göttingen, Max Planck Institute for Solar System Research, Max Planck Society;

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Heinzel, P.
Stellar Astrophysics, MPI for Astrophysics, Max Planck Society;

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Sasso, C.
IMPRS on Physical Processes in the Solar System and Beyond, Max Planck Institute for Solar System Research, Max Planck Society;

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Stangalini, M.
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

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Teriaca, L.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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Bruno, R.
Department: Neuroimmunology / Wekerle, MPI of Neurobiology, Max Planck Society;

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https://ui.adsabs.harvard.edu/abs/2023A&A...670L..18T
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Citation

Telloni, D., Antonucci, E., Adhikari, L., Zank, G. P., Giordano, S., Vai, M., et al. (2023). First polar observations of the fast solar wind with the Metis - Solar Orbiter coronagraph: Role of 2D turbulence energy dissipation in the wind acceleration. Astronomy and Astrophysics, 670, L18. doi:10.1051/0004-6361/202245759.

Cite as: https://hdl.handle.net/21.11116/0000-000C-AB10-1

Abstract

Context. The fast solar wind is known to emanate from polar coronal holes.
Aims: This Letter reports the first estimate of the expansion rate of polar coronal flows performed by the Metis coronagraph on board Solar Orbiter.
Methods: By exploiting simultaneous measurements in polarized white light and ultraviolet intensity of the neutral hydrogen Lyman-α line, it was possible to extend observations of the outflow velocity of the main component of the solar wind from polar coronal holes out to 5.5 R_⊙, the limit of diagnostic applicability and observational capabilities.
Results: We complement the results obtained with analogous polar observations performed with the UltraViolet Coronagraph Spectrometer on board the SOlar and Heliospheric Observatory during the previous full solar activity cycle, and find them to be satisfactorily reproduced by a magnetohydrodynamic turbulence model.
Conclusions: This suggests that the dissipation of 2D turbulence energy is a viable mechanism for coronal plasma heating and the subsequent acceleration of the fast solar wind.