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Evolution of Solar Wind Turbulence during Radial Alignment of Parker Solar Probe and Solar Orbiter in 2022 December
Department of Space Science, University of Alabama in Huntsville, Huntsville, AL, USA.
Department of Space Science, University of Alabama in Huntsville, Huntsville, AL, USA; lz0009@uah.edu; Center for Space Plasma and Aeronomic Research (CSPAR), University of Alabama in Huntsville, Huntsville, AL, USA.
Center for Space Plasma and Aeronomic Research (CSPAR), University of Alabama in Huntsville, Huntsville, AL, USA.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics. Institute for the Science and Technology of Plasmas, National Research Council, Via Amendola 122/D, I-70126 Bari, Italy.ORCID iD: 0000-0002-5981-7758
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2025 (English)In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 278, no 2, article id 40Article in journal (Refereed) Published
Abstract [en]

We investigate the radial evolution of solar wind turbulence during the radial alignment of Parker Solar Probe (PSP) and Solar Orbiter (SO) on 2022 December 10, with PSP located at approximately 0.11 au and SO near 0.88 au. To identify nearly the same plasma parcel crossing both spacecraft, we apply a ballistic propagation model with time-constant acceleration constrained by in situ solar wind velocity measurements at PSP and SO. We trace the magnetic footpoint of the plasma parcel back to the photosphere using a potential field source surface model based on a Global Oscillations Network Group synoptic magnetogram. Field and plasma measurements from PSP and SO are used to analyze power spectral density (PSD), spectral scaling, magnetic compressibility, and intermittency. Our results show that (1) the trace PSD of magnetic fluctuations steepens in the inertial range and flattens in the dissipation range with increasing radial distance; (2) the spectral break shifts to lower frequencies at SO; and (3) the Castaing model reveals multifractal intermittency in the inertial range, with slightly weaker intermittency at SO. These findings based on the same plasma parcel are consistent with the results of statistical studies on the radial evolution of turbulence and provide a reference for theoretical modeling of turbulence in the inner heliosphere.

Place, publisher, year, edition, pages
American Astronomical Society , 2025. Vol. 278, no 2, article id 40
National Category
Astronomy, Astrophysics and Cosmology Fusion, Plasma and Space Physics
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URN: urn:nbn:se:kth:diva-364410DOI: 10.3847/1538-4365/add011ISI: 001499093900001Scopus ID: 2-s2.0-105007094153OAI: oai:DiVA.org:kth-364410DiVA, id: diva2:1968225
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QC 20250613

Available from: 2025-06-12 Created: 2025-06-12 Last updated: 2025-06-13Bibliographically approved

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