Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach

Details Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach

2011-01-20

arxiv.org/abs/1101.3913v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 7 figures, accepted in A&A

Scientific paper

We derive the dynamics of magnetohydrodynamic waves in two-fluid partially ionized plasmas and to compare the results with those obtained under single-fluid description. Two-fluid magnetohydrodynamic equations are used, where ion-electron plasma and neutral particles are considered as separate fluids. Dispersion relations of linear magnetohydrodynamic waves are derived for simplest case of homogeneous medium. Frequencies and damping rates of waves are obtained for different parameters of background plasma. We found that two- and single-fluid descriptions give similar results for low frequency waves. However, the dynamics of MHD waves in two-fluid approach is significantly changed when the wave frequency becomes comparable or higher than ion-neutral collision frequency. Alfven and fast magneto-acoustic waves attain their maximum damping rate at particular frequencies (for example, the peak frequency equals 2.5 ion-neutral collision frequency for 50 % of neutral Hydrogen) in wave spectrum. The damping rates are reduced for higher frequency waves. The new mode of slow magneto-acoustic wave appears for higher frequency branch, which is connected to neutral hydrogen fluid. The single-fluid approach perfectly deals with slow processes in partially ionized plasmas, but fails for time-scales smaller than ion-neutral collision time. Therefore, two-fluid approximation should be used for the description of relatively fast processes. Some results of single-fluid description, for example the damping of high-frequency Alfven waves in the solar chromosphere due to ion-neutral collisions, should be revised in future.

Affiliated with

Also associated with

No associations

Rating

Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach 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 Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetohydrodynamic waves in solar partially ionized plasmas: two-fluid approach will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-333656