The Ion Transition Range of Solar Wind Turbulence in the Inner Heliosphere: Parker Solar Probe Observations - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The Astrophysical journal letters Année : 2021

The Ion Transition Range of Solar Wind Turbulence in the Inner Heliosphere: Parker Solar Probe Observations

F. Sahraoui
N. Andrés
L. Hadid
Z. Yuan
  • Fonction : Auteur
J. He
J. Zhao
S. Galtier
X. Deng
L. Yu
  • Fonction : Auteur
S. Xu
  • Fonction : Auteur
Y. Wei
S. Bale
J. Kasper

Résumé

The scaling of the turbulent spectra provides a key measurement that allows us to discriminate between different theoretical predictions of turbulence. In the solar wind, this has driven a large number of studies dedicated to this issue using in situ data from various orbiting spacecraft. While a semblance of consensus exists regarding the scaling in the magnetohydrodynamic (MHD) and dispersive ranges, the precise scaling in the transition range and the actual physical mechanisms that control it remain open questions. Using the high-resolution data in the inner heliosphere from the Parker Solar Probe mission, we find that the sub-ion scales (i.e., at the frequency f similar to [2, 9] Hz) follow a power-law spectrum f(alpha) with a spectral index alpha varying between -3 and -5.7. Our results also show that there is a trend toward an anticorrelation between the spectral slopes and the power amplitudes at the MHD scales, in agreement with previous studies: the higher the power amplitude the steeper the spectrum at sub-ion scales. A similar trend toward an anticorrelation between steep spectra and increasing normalized cross helicity is found, in agreement with previous theoretical predictions about the imbalanced solar wind. We discuss the ubiquitous nature of the ion transition range in solar wind turbulence in the inner heliosphere.
Fichier principal
Vignette du fichier
Huang_2021_ApJL_909_L7.pdf (1.59 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03334254 , version 1 (16-09-2022)

Identifiants

Citer

S. Huang, F. Sahraoui, N. Andrés, L. Hadid, Z. Yuan, et al.. The Ion Transition Range of Solar Wind Turbulence in the Inner Heliosphere: Parker Solar Probe Observations. The Astrophysical journal letters, 2021, 909 (1), pp.L7. ⟨10.3847/2041-8213/abdaaf⟩. ⟨hal-03334254⟩
66 Consultations
26 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More