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Magnetic Field Spectral Evolution in the Inner Heliosphere

Sioulas, N; Huang, Z; Shi, C; Velli, M; Tenerani, A; Bowen, TA; Bale, SD; ... Fedorov, A; + view all (2023) Magnetic Field Spectral Evolution in the Inner Heliosphere. Astrophysical Journal Letters , 943 (1) , Article L8. 10.3847/2041-8213/acaeff. Green open access

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Abstract

Parker Solar Probe and Solar Orbiter data are used to investigate the radial evolution of magnetic turbulence between 0.06 ≲ R ≲ 1 au. The spectrum is studied as a function of scale, normalized to the ion inertial scale d i . In the vicinity of the Sun, the inertial range is limited to a narrow range of scales and exhibits a power-law exponent of, α B = −3/2, independent of plasma parameters. The inertial range grows with distance, progressively extending to larger spatial scales, while steepening toward a α B = −5/3 scaling. It is observed that spectra for intervals with large magnetic energy excesses and low Alfvénic content steepen significantly with distance, in contrast to highly Alfvénic intervals that retain their near-Sun scaling. The occurrence of steeper spectra in slower wind streams may be attributed to the observed positive correlation between solar wind speed and Alfvénicity.

Type: Article
Title: Magnetic Field Spectral Evolution in the Inner Heliosphere
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/2041-8213/acaeff
Publisher version: https://doi.org/10.3847/2041-8213%2Facaeff
Language: English
Additional information: © 2023 IOP Publishing. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10164621
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