Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-02
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, to be published in "Small Ionized and Neutral Structures in the Diffuse Interstellar Medium" (ASP)
Scientific paper
The problems with explaining the Small Ionized and Neutral Structures (SINS) appealing to turbulence stem from inefficiency of the Kolmogorov cascade in creating large fluctuations at sufficiently small scales. However, other types of cascades are possible. When magnetic turbulence in a fluid with viscosity that is much larger than resistivity gets to a viscous damping scale, the turbulence does not vanish. Instead, it gets into a different new regime. Viscosity-damped turbulence produces fluctuations on the small scales. Magnetic fields sheared by turbulent motions by eddies not damped by turbulence create small scale filaments that are confined by the external plasma pressure. This creates small scale density fluctuations. In addition, extended current sheets create even stronger density gradients that accompany field reversals in the plane perpendicular to mean magnetic field. Those can be responsible for the SINS formation. This scenario is applicable to partially ionized gas. More studies of reconnection in the viscosity dominated regime are necessary to understand better the extend to which the magnetic reversals can compress the gas.
No associations
LandOfFree
SINS of Viscosity Damped Turbulence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with SINS of Viscosity Damped Turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SINS of Viscosity Damped Turbulence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-265225