Turbulence and particle energization in twisted flux ropes under solar-wind conditions

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Author(s)Pezzi, O.
Author(s)Trotta, D.
Author(s)Benella, S.
Author(s)Sorriso-Valvo, L.
Author(s)Malara, F.
Author(s)Pucci, F.
Author(s)Meringolo, C.
Author(s)Matthaeus, W. H.
Author(s)Servidio, S.
Date Accessioned2024-06-21T18:42:25Z
Date Available2024-06-21T18:42:25Z
Publication Date2024-06-04
DescriptionThis article was originally published in Astronomy & Astrophysics. The version of record is available at: https://doi.org/10.1051/0004-6361/202348700. © The Authors 2024. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
AbstractContext. The mechanisms regulating the transport and energization of charged particles in space and astrophysical plasmas are still debated. Plasma turbulence is known to be a powerful particle accelerator. Large-scale structures, including flux ropes and plasmoids, may contribute to confining particles and lead to fast particle energization. These structures may also modify the properties of the turbulent, nonlinear transfer across scales. Aims. We aim to investigate how large-scale flux ropes are perturbed and, simultaneously, how they influence the nonlinear transfer of turbulent energy toward smaller scales. We then intend to address how these structures affect particle transport and energization. Methods. We adopted magnetohydrodynamic simulations perturbing a large-scale flux rope in solar-wind conditions and possibly triggering turbulence. Then, we employed test-particle methods to investigate particle transport and energization in the perturbed flux rope. Results. The large-scale helical flux rope inhibits the turbulent cascade toward smaller scales, especially if the amplitude of the initial perturbations is not large (∼5%). In this case, particle transport is inhibited inside the structure. Fast particle acceleration occurs in association with phases of trapped motion within the large-scale flux rope.
SponsorThe authors are grateful to the reviewer for the comments which improved the manuscript. O.P. thanks R. Vainio and A. Verdini for productive discussions on this topic. O.P., L.S.V., and F.P. acknowledge the project “2022KL38BK – The ULtimate fate of TuRbulence from space to laboratory plAsmas (ULTRA)” (Master CUP B53D23004850006) by the Italian Ministry of University and Research, funded under the National Recovery and Resilience Plan (NRRP), Mission 4 – Component C2 – Investment 1.1, “Fondo per il Programma Nazionale di Ricerca e Progetti di Rilevante Interesse Nazionale (PRIN 2022)” (PE9) by the European Union – NextGenerationEU. This work has received funding from the European Unions Horizon 2020 research and innovation programme under grant agreement No. 101004159 (https://www.serpentine-h2020.eu). L.S.-V. is supported by the Swedish Research Council (VR) Research Grant N. 2022-03352. W.H.M. is partially supported at the University of Delaware by US National Science Foundation grant AGS/PHYS-2108834 (NSFDOE), by NASA Heliophysics GI grant (PSP) 80 NSSC21K1765, and by the PSP ISOIS Theory and modeling project on subcontract SUB0000165 from Princeton University. The simulations have been performed at the Newton cluster at University of Calabria and the work is supported by “Progetto STAR 2-PIR01 00008” (Italian Ministry of University and Research). S.S. acknowledges supercomputing resources and support from ICSC-Centro Nazionale di Ricerca in High Performance Computing, Big Data and Quantum Computing-and hosting entity, funded by European Union-NextGenerationEU. This work was partially supported by the Royal Society (UK) and the Consiglio Nazionale delle Ricerche (Italy) through the International Exchanges Cost Share scheme/Joint Bilateral Agreement project “Multi-scale electrostatic energisation of plasmas: comparison of collective processes in laboratory and space” (award numbers IEC/R2/222050 and SAC.AD002.043.021).
CitationPezzi, O., D. Trotta, S. Benella, L. Sorriso-Valvo, F. Malara, F. Pucci, C. Meringolo, W. H. Matthaeus, and S. Servidio. “Turbulence and Particle Energization in Twisted Flux Ropes under Solar-Wind Conditions.” Astronomy & Astrophysics 686 (June 2024): A116. https://doi.org/10.1051/0004-6361/202348700.
ISSN1432-0746
URLhttps://udspace.udel.edu/handle/19716/34510
Languageen_US
PublisherAstronomy & Astrophysics
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
Keywordsacceleration of particles
Keywordsmagnetohydrodynamics (MHD)
Keywordsplasmas
Keywordsturbulence
Keywordsmethods: numerical
Keywordssolar wind
TitleTurbulence and particle energization in twisted flux ropes under solar-wind conditions
TypeArticle
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