Energy Cascades in a Partially Ionized Astrophysical Plasma

Details Energy Cascades in a Partially Ionized Astrophysical Plasma Energy Cascades in a Partially Ionized Astrophysical Plasma

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...688..683s&link_type=abstract

The Astrophysical Journal, Volume 688, Issue 1, pp. 683-694.

Astronomy and Astrophysics

Astronomy

8

Interplanetary Medium, Ism: Kinematics And Dynamics, Methods: Numerical, Magnetohydrodynamics: Mhd, Sun: Solar Wind, Turbulence

Scientific paper

A local turbulence model is developed to study energy cascades in the interstellar medium (ISM) based on self-consistent two-dimensional fluid simulations. The model describes a partially ionized magnetofluid ISM that couples a neutral hydrogen fluid with a plasma primarily through charge-exchange interactions. Charge-exchange interactions are ubiquitous in warm ISM plasma, and the strength of the interaction depends largely on the relative speed between the plasma and the neutral fluid. Unlike small-length scale linear collisional dissipation in a single fluid, charge-exchange processes introduce channels that can be effective on a variety of length scales that depend on the neutral and plasma densities, temperature, relative velocities, charge-exchange cross section, and the characteristic length scales. We find, from scaling arguments and nonlinear coupled fluid simulations, that charge-exchange interactions modify spectral transfer associated with large-scale energy-containing eddies. Consequently, the warm ISM turbulent cascade rate prolongs spectral transfer among inertial range turbulent modes. Turbulent spectra associated with the neutral and plasma ISM fluids are therefore steeper than those predicted by Kolmogorov's phenomenology.

Affiliated with

Also associated with

No associations

Rating

Energy Cascades in a Partially Ionized Astrophysical Plasma 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 Energy Cascades in a Partially Ionized Astrophysical Plasma, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy Cascades in a Partially Ionized Astrophysical Plasma will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1842279