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

0571138 - ASÚ 2024 RIV FR eng J - Journal Article
Telloni, D. - Antonucci, E. - Adhikari, L. - Heinzel, Petr … Total 36 authors
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 & Astrophysics. Roč. 670, February (2023), č. článku L18. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GA22-34841S
Institutional support: RVO:67985815
Keywords : magnetohydrodynamics * Sun * solar wind
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access

This Letter reports the first estimate of the expansion rate of polar coronal flows performed by the Metis coronagraph on board Solar Orbiter. 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. 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.
Permanent Link: https://hdl.handle.net/11104/0342430