Dissemin is shutting down on January 1st, 2025

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American Astronomical Society, Astrophysical Journal, 2(935), p. 112, 2022

DOI: 10.3847/1538-4357/ac8103

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Linking Small-scale Solar Wind Properties with Large-scale Coronal Source Regions through Joint Parker Solar Probe–Metis/Solar Orbiter Observations

Journal article published in 2022 by Daniele Telloni ORCID, Gary P. Zank ORCID, Luca Sorriso-Valvo ORCID, Raffaella D’Amicis ORCID, Olga Panasenco ORCID, Roberto Susino ORCID, Roberto Bruno ORCID, Denise Perrone ORCID, Laxman Adhikari ORCID, Haoming Liang ORCID, Masaru Nakanotani ORCID, Lingling Zhao ORCID, Lina Z. Hadid ORCID, Beatriz Sánchez-Cano ORCID, Daniel Verscharen ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract The solar wind measured in situ by Parker Solar Probe in the very inner heliosphere is studied in combination with the remote-sensing observation of the coronal source region provided by the METIS coronagraph aboard Solar Orbiter. The coronal outflows observed near the ecliptic by Metis on 2021 January 17 at 16:30 UT, between 3.5 and 6.3 R above the eastern solar limb, can be associated with the streams sampled by PSP at 0.11 and 0.26 au from the Sun, in two time intervals almost 5 days apart. The two plasma flows come from two distinct source regions, characterized by different magnetic field polarity and intensity at the coronal base. It follows that both the global and local properties of the two streams are different. Specifically, the solar wind emanating from the stronger magnetic field region has a lower bulk flux density, as expected, and is in a state of well-developed Alfvénic turbulence, with low intermittency. This is interpreted in terms of slab turbulence in the context of nearly incompressible magnetohydrodynamics. Conversely, the highly intermittent and poorly developed turbulent behavior of the solar wind from the weaker magnetic field region is presumably due to large magnetic deflections most likely attributed to the presence of switchbacks of interchange reconnection origin.