Energy occupation of waves and structures in 3D compressive MHD turbulence
Abstract
Abstract Structures and propagating waves are often observed in solar wind turbulence. Their origins and features remain to be uncovered. In this work, we use 3D driven, compressible MHD turbulence simulations to investigate the global signatures of the driven fluctuations in whole spatial and temporal domain. With four-dimensional spatial-temporal (x, y, z, t) Fourier transformations implemented, we have identified two distinct main populations: waves, which satisfy the $$\omega -\boldsymbol {k}$$ dispersion relations and are propagating; and structures, which satisfy the polarization relations but non-propagating (ω = 0). Whereas the overall turbulent energy spectrum is still consistent with k−5/3, the contributions from waves and structures show very different behaviour in $$\boldsymbol {k}$$ space, with structures dominating at small k but waves becomes comparable to structures at large k. Overall, the fluctuations in the directions perpendicular to the large-scale mean field $$\boldsymbol {B_0}$$ are a manifestation of structures, while along the parallel direction, the fluctuations are dominated by waves. Also, a significant portion of the incompressible structures are the Alfvénic nature, and with imbalanced increased, the waves predominantly propagate in one direction and nearly perpendicular to $$\boldsymbol {B_0}$$. Differentiating the relative contributions from waves and structures could have important implications for understanding the non-linear cascade processes in the inertial range as well as particle-fluctuation interactions at small scales.
- Authors:
-
- SIGMA Weather Group, State Key Laboratory for Space Weather, National Space Science Center, Chinese Academy of Sciences, 100190, Beijing, China, Theoretical Division, MS B284, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
- Theoretical Division, MS B284, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
- SIGMA Weather Group, State Key Laboratory for Space Weather, National Space Science Center, Chinese Academy of Sciences, 100190, Beijing, China
- School of Earth and Space Sciences, Peking University, 100871 Beijing, China
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1542504
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 488 Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Yang, L. P., Li, H., Li, S. T., Zhang, L., He, J. S., and Feng, X. S. Energy occupation of waves and structures in 3D compressive MHD turbulence. United Kingdom: N. p., 2019.
Web. doi:10.1093/mnras/stz1747.
Yang, L. P., Li, H., Li, S. T., Zhang, L., He, J. S., & Feng, X. S. Energy occupation of waves and structures in 3D compressive MHD turbulence. United Kingdom. https://doi.org/10.1093/mnras/stz1747
Yang, L. P., Li, H., Li, S. T., Zhang, L., He, J. S., and Feng, X. S. Wed .
"Energy occupation of waves and structures in 3D compressive MHD turbulence". United Kingdom. https://doi.org/10.1093/mnras/stz1747.
@article{osti_1542504,
title = {Energy occupation of waves and structures in 3D compressive MHD turbulence},
author = {Yang, L. P. and Li, H. and Li, S. T. and Zhang, L. and He, J. S. and Feng, X. S.},
abstractNote = {Abstract Structures and propagating waves are often observed in solar wind turbulence. Their origins and features remain to be uncovered. In this work, we use 3D driven, compressible MHD turbulence simulations to investigate the global signatures of the driven fluctuations in whole spatial and temporal domain. With four-dimensional spatial-temporal (x, y, z, t) Fourier transformations implemented, we have identified two distinct main populations: waves, which satisfy the $\omega -\boldsymbol {k}$ dispersion relations and are propagating; and structures, which satisfy the polarization relations but non-propagating (ω = 0). Whereas the overall turbulent energy spectrum is still consistent with k−5/3, the contributions from waves and structures show very different behaviour in $\boldsymbol {k}$ space, with structures dominating at small k but waves becomes comparable to structures at large k. Overall, the fluctuations in the directions perpendicular to the large-scale mean field $\boldsymbol {B_0}$ are a manifestation of structures, while along the parallel direction, the fluctuations are dominated by waves. Also, a significant portion of the incompressible structures are the Alfvénic nature, and with imbalanced increased, the waves predominantly propagate in one direction and nearly perpendicular to $\boldsymbol {B_0}$. Differentiating the relative contributions from waves and structures could have important implications for understanding the non-linear cascade processes in the inertial range as well as particle-fluctuation interactions at small scales.},
doi = {10.1093/mnras/stz1747},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 488,
place = {United Kingdom},
year = {Wed Jun 26 00:00:00 EDT 2019},
month = {Wed Jun 26 00:00:00 EDT 2019}
}
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