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.
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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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