# New Regime of Magnetohydrodynamic Turbulence: Cascade below the Viscous Cutoff

@article{Cho2002NewRO,
title={New Regime of Magnetohydrodynamic Turbulence: Cascade below the Viscous Cutoff},
author={Jungyeon Cho and Alex Lazarian and Ethan T. Vishniac},
journal={The Astrophysical Journal Letters},
year={2002},
volume={566},
pages={L49 - L52}
}
• Published 7 December 2001
• Physics, Geology
• The Astrophysical Journal Letters
In astrophysical situations, e.g., in the interstellar medium (ISM), neutrals can provide viscous damping on scales much larger than the magnetic diffusion scale. Through numerical simulations, we have found that the magnetic field can have a rich structure below the dissipation cutoff scale. This implies that magnetic fields in the ISM can have structures on scales much smaller than parsec scales. Our results show that the magnetic energy contained in a wavenumber band is independent of the…

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## References

SHOWING 1-10 OF 21 REFERENCES
Simulations of Magnetohydrodynamic Turbulence in a Strongly Magnetized Medium
• Physics
• 2001
We analyze three-dimensional numerical simulations of driven incompressible magnetohydrodynamic (MHD) turbulence in a periodic box threaded by a moderately strong external magnetic field. We sum over
The Anisotropy of Magnetohydrodynamic Alfvénic Turbulence
• Physics
• 2000
We perform direct three-dimensional numerical simulations for magnetohydrodynamic (MHD) turbulence in a periodic box of size 2π threaded by strong uniform magnetic fields. We use a pseudospectral
Toward a theory of interstellar turbulence. 2. Strong Alfvenic turbulence
• Physics
• 1994
We continue to investigate the possibility that interstellar turbulence is caused by nonlinear interactions among shear Alfven waves. Here, as in Paper I, we restrict attention to the symmetric case
Is Thermal Instability Significant in Turbulent Galactic Gas?
• Physics
• 2000
We investigate numerically the role of thermal instability (TI) as a generator of density structures in the interstellar medium (ISM), both by itself and in the context of a globally turbulent
The Anisotropy of MHD Alfv\'{e}nic Turbulence
• Physics
• 2000
We perform direct 3-dimensional numerical simulations for magnetohydrodynamic (MHD) turbulence in a periodic box of size $2\pi$ threaded by strong uniform magnetic fields. We use a pseudo-spectral
Velocity and Density Spectra of the Small Magellanic Cloud
• Physics
• 2001
This Letter reports results on the statistical analysis of H I turbulence in the Small Magellanic Cloud (SMC). We use 21 cm channel maps, obtained with the Australia Telescope Compact Array and the
Dense cores in dark clouds. III. Subsonic turbulence.
In 43 dark clouds with narrow molecular lines, significant correlations exist between line width and map size of the form ..delta..vproportionalR/sup 0.5/, and between mean density and map size of
Tiny-Scale Atomic Structure and the Cold Neutral Medium--Review and Recap
We consider the tiny-scale atomic structure (TSAS) on scales of tens of astronomical units, which has been detected by 21 cm absorption lines against quasars with VLBI techniques, against pulsars
The small-scale structure in interstellar H i: a resolvable puzzle
During the past decade or so, measurements of Galactic H i absorption using VLBI against extragalactic sources, as well as multi-epoch observations in pulsar directions, have detected small-scale
Electron Density Power Spectrum in the Local Interstellar Medium
• Physics
• 1995
Interstellar scintillation (ISS), fluctuations in the amplitude and phase of radio waves caused by scattering in the interstellar medium, is important as a diagnostic of interstellar plasma