Journal ArticleDOI
Solar wind density spectra around the ion spectral break
Jana Safrankova,Zdeněk Němeček,František Němec,Lubomír Přech,Alexander Pitňa,Christopher H. K. Chen,G. N. Zastenker +6 more
TLDR
In this paper, a large statistical analysis of frequency spectra of the solar wind density fluctuations in the range 0.001-5 Hz (corresponding to spatial scales of 100-5 × 105 km).Abstract:
This paper presents a large statistical analysis of frequency spectra of the solar wind density fluctuations in the range 0.001–5 Hz (corresponding to spatial scales of 100–5 × 105 km). The analysis confirms that the spectrum consists of three segments divided by two breakpoints and that each of the segments can be described by a power-law function with a spectral index α. The first segment corresponds to MHD scales and is followed by a plateau, and the third segment can be associated with the kinetic range. The statistics show that the values of the spectral slopes depend on the density fluctuations; their increasing amplitude leads to a steepening of each segment. The index of −1.8 can typically be found at MHD scales and averaging of the spectra in the frequency domain leads to an index of −8/3 at kinetic scales, whereas averaging in frequencies normalized to the ion gyrostructure frequency, fg, defined as the ratio of the solar wind bulk speed and thermal ion gyroradius, provides a value of −7/3. Both breakpoint locations are controlled by the gyrostructure frequency.read more
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Recent progress in astrophysical plasma turbulence from solar wind observations
TL;DR: In this paper, the authors summarise some of the recent progress that has been made in understanding astrophysical plasma turbulence in the solar wind, from in situ spacecraft observations, along with comparison to recent models of strong Alfvenic turbulence.
Journal ArticleDOI
Solar Wind Turbulent Cascade from MHD to Sub-ion Scales: Large-size 3D Hybrid Particle-in-cell Simulations
TL;DR: In this article, the authors investigated the spectral properties of the turbulent cascade from fluid to kinetic scales in collisionless plasmas by means of large-size three-dimensional (3D) hybrid (fluid electrons, kinetic protons) particle-in-cell simulations.
Journal ArticleDOI
First In Situ Measurements of Electron Density and Temperature from Quasi-thermal Noise Spectroscopy with Parker Solar Probe/FIELDS
Michel Moncuquet,Nicole Meyer-Vernet,Karine Issautier,Marc Pulupa,John W. Bonnell,Stuart D. Bale,Thierry Dudok de Wit,Keith Goetz,Léa Griton,Léa Griton,Peter R. Harvey,Robert J. MacDowall,Milan Maksimovic,David M. Malaspina +13 more
TL;DR: In this paper, a simplified analysis of the plasma quasi-thermal noise (QTN) spectrum measured by the Radio Frequency Spectrometer (RFS/FIELDS) is presented.
Journal ArticleDOI
Solar wind turbulent cascade from MHD to sub-ion scales: large-size 3D hybrid particle-in-cell simulations
TL;DR: In this paper, the authors investigated the properties of the turbulent cascade from fluid to kinetic scales in collisionless plasmas by means of large-size three-dimensional (3D) hybrid (fluid electrons, kinetic protons) particle-in-cell simulations.
References
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TL;DR: In this article, the authors consider the problem of finding the components of the velocity at every point of a point with rectangular cartesian coordinates x 1, x 2, x 3, x 4, x 5, x 6, x 7, x 8.
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The Solar Wind as a Turbulence Laboratory
Roberto Bruno,Vincenzo Carbone +1 more
TL;DR: In this paper, the authors focus on a topic of fundamental importance for both plasma physics and astrophysics, namely the occurrence of large-amplitude low-frequency fluctuations of the fields that describe the plasma state.
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The Local Structure of Turbulence in Incompressible Viscous Fluid for Very Large Reynolds Numbers
TL;DR: In this article, the authors consider the problem of finding the components of the velocity at every point of a point with rectangular cartesian coordinates x 1, x 2, x 3, x 4, x 5, x 6, x 7, x 8.
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MHD structures, waves and turbulence in the solar wind : observations and theories
Chia-Ying Tu,Eckart Marsch +1 more
TL;DR: A comprehensive overview of recent observational and theoretical results on solar wind structures and fluctuations and magnetohydrodynamic waves and turbulence, with preference given to phenomena in the inner heliosphere, is presented in this paper.
Journal ArticleDOI
Astrophysical Gyrokinetics: Kinetic and Fluid Turbulent Cascades in Magnetized Weakly Collisional Plasmas
Alexander Schekochihin,Alexander Schekochihin,Steven Cowley,Steven Cowley,William Dorland,Gregory W. Hammett,Gregory G. Howes,Eliot Quataert,Tomoya Tatsuno +8 more
TL;DR: In this paper, a theoretical framework for understanding plasma turbulence in astrophysical plasmas is presented, motivated by observations of electromagnetic and density fluctuations in the solar wind, interstellar medium and galaxy clusters, as well as by models of particle heating in accretion disks.