Subash Adhikari - Statistics of Pressure Fluctuations in Turbulent

Journal article

S. Adhikari, W. H. Matthaeus, T. N. Parashar, M. A. Shay, P. A. Cassak
Monthly Notices of the Royal Astronomical Society, vol. 526(3), 2023, pp. 4067–407

DOI: 10.1093/mnras/stad2871

Cite

APA Click to copy
Adhikari, S., Matthaeus, W. H., Parashar, T. N., Shay, M. A., & Cassak, P. A. (2023). Statistics of Pressure Fluctuations in Turbulent Kinetic Plasmas. Monthly Notices of the Royal Astronomical Society, 526(3), 4067–4407. https://doi.org/10.1093/mnras/stad2871

Chicago/Turabian Click to copy
Adhikari, S., W. H. Matthaeus, T. N. Parashar, M. A. Shay, and P. A. Cassak. “Statistics of Pressure Fluctuations in Turbulent Kinetic Plasmas.” Monthly Notices of the Royal Astronomical Society 526, no. 3 (2023): 4067–407.

MLA Click to copy
Adhikari, S., et al. “Statistics of Pressure Fluctuations in Turbulent Kinetic Plasmas.” Monthly Notices of the Royal Astronomical Society, vol. 526, no. 3, 2023, pp. 4067–407, doi:10.1093/mnras/stad2871.

BibTeX Click to copy

@article{s2023a,
  title = {Statistics of Pressure Fluctuations in Turbulent Kinetic Plasmas},
  year = {2023},
  issue = {3},
  journal = {Monthly Notices of the Royal Astronomical Society},
  pages = {4067–407},
  volume = {526},
  doi = {10.1093/mnras/stad2871},
  author = {Adhikari, S. and Matthaeus, W. H. and Parashar, T. N. and Shay, M. A. and Cassak, P. A.}
}

Abstract

In this study, we explore the statistics of pressure fluctuations in kinetic collisionless turbulence. A 2.5D kinetic particle-in-cell simulation of decaying turbulence is used to investigate pressure balance via the evolution of thermal and magnetic pressure in a plasma with β of order unity. We also discuss the behaviour of thermal, magnetic, and total pressure structure functions and their corresponding wavenumber spectra. The total pressure spectrum exhibits a slope of −7/3 extending for about a decade in the ion-inertial range. In contrast, shallower −5/3 spectra are characteristic of the magnetic pressure and thermal pressure. The steeper total pressure spectrum is a consequence of cancellation caused by density-magnetic field magnitude anti-correlation. Further, we evaluate higher order total pressure structure functions in an effort to discuss intermittency and compare the power exponents with higher order structure functions of velocity and magnetic fluctuations. Finally, applications to astrophysical systems are also discussed.