UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Evolution of anisotropic turbulence in the fast and slow solar wind: Theory and Solar Orbiter measurements

Adhikari, L; Zank, GP; Zhao, L-L; Telloni, D; Horbury, TS; O'Brien, H; Evans, V; ... Fedorov, A; + view all (2021) Evolution of anisotropic turbulence in the fast and slow solar wind: Theory and Solar Orbiter measurements. Astronomy and Astrophysics 10.1051/0004-6361/202140672. (In press). Green open access

[thumbnail of aa40672-21.pdf]
Preview
Text
aa40672-21.pdf - Accepted Version

Download (1MB) | Preview

Abstract

Aims: Solar Orbiter (SolO) was launched on February 9, 2020, allowing us to study the nature of turbulence in the inner heliopshere. We investigate the evolution of anisotropic turbulence in the fast and slow solar wind in the inner heliosphere using the nearly incompressible magnetohydrodynamic (NI MHD) turbulence model and SolO measurements. Methods: We calculated the two dimensional (2D) and the slab variances of the energy in forward and backward propagating modes, the fluctuating magnetic energy, the fluctuating kinetic energy, the normalized residual energy, and the normalized cross-helicity as a function of the angle between the mean solar wind speed and the mean magnetic field (θUB), and as a function of the heliocentric distance using SolO measurements. We compared the observed results and the theoretical results of the NI MHD turbulence model as a function of the heliocentric distance. Results: The results show that the ratio of 2D energy and slab energy of forward and backward propagating modes, magnetic field fluctuations, and kinetic energy fluctuations increases as the angle between the mean solar wind flow and the mean magnetic field increases from θUB = 0 ◦ to approximately θUB = 90◦ and then decreases as θUB → 180◦ . We find that solar wind turbulence is a superposition of the dominant 2D component and a minority slab component as a function of the heliocentric distance. We find excellent agreement between the theoretical results and observed results as a function of the heliocentric distance.

Type: Article
Title: Evolution of anisotropic turbulence in the fast and slow solar wind: Theory and Solar Orbiter measurements
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202140672
Publisher version: https://doi.org/10.1051/0004-6361/202140672
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: The Sun, Solar wind, Anisotropy, Interplanetary turbulence
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/10132061
Downloads since deposit
52Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item