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Journal Articles The Astrophysical journal letters Year : 2023

Magnetic Field Spectral Evolution in the Inner Heliosphere

Nikos Sioulas
  • Function : Author
Zesen Huang
  • Function : Author
Chen Shi
  • Function : Author
Marco Velli
  • Function : Author
Anna Tenerani
  • Function : Author
Trevor A. Bowen
  • Function : Author
Stuart D. Bale
  • Function : Author
Jia Huang
  • Function : Author
Loukas Vlahos
  • Function : Author
L. D. Woodham
  • Function : Author
T. S. Horbury
  • Function : Author
Davin Larson
  • Function : Author
Justin Kasper
  • Function : Author
Christopher J. Owen
  • Function : Author
Michael L. Stevens
  • Function : Author
Anthony Case
  • Function : Author
Marc Pulupa
  • Function : Author
David M. Malaspina
  • Function : Author
J. W. Bonnell
  • Function : Author
Roberto Livi
  • Function : Author
Keith Goetz
  • Function : Author
Peter R. Harvey
  • Function : Author
Robert J. Macdowall
  • Function : Author

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.
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insu-04043844 , version 1 (24-03-2023)

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Nikos Sioulas, Zesen Huang, Chen Shi, Marco Velli, Anna Tenerani, et al.. Magnetic Field Spectral Evolution in the Inner Heliosphere. The Astrophysical journal letters, 2023, 943, ⟨10.3847/2041-8213/acaeff⟩. ⟨insu-04043844⟩
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