MHD Turbulence in an Open Magnetic Region With Alfven Waves Weak Reflection.

Details MHD Turbulence in an Open Magnetic Region With Alfven Waves Weak Reflection. MHD Turbulence in an Open Magnetic Region With Alfven Waves Weak Reflection.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh12a0412d&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH12A-0412

Physics

2149 Mhd Waves And Turbulence, 7511 Coronal Holes, 7843 Numerical Simulation Studies, 7863 Turbulence

Scientific paper

We have shown in a previous work (Dmitruk et al, Phys. Plasmas 8, 2377, 2001) that in order to sustain MHD turbulence in an open magnetic region driven by injected waves through the boundary, it is necessary to have reflections of those waves and to impose boundary conditions which allow the presence of non-propagating structures. However, an important objection is how strong the reflections have to be, in order to get turbulence sustainment. We show here, by doing numerical simulations of the RMHD equations in an inhomogeneous medium, that even in the case of very weak reflections (1 percent energy in reflected fluctuations) corresponding to a system very close to a minimal cross helicity state, MHD turbulence can still be sustained, a broadband energy spectrum can be developed, small scale structures appear and the system is efficient on dissipating the injected energy, provided an appropriate timescale ordering is maintaned by the forcing. Moreover, we study the timescale conditions under which MHD turbulence will be even more favored. The basic model presented here could have interesting implications for the understanding of the problem of the heating of the lower solar corona in magnetically open regions. This research supported by NSF grants ATM-9977692 and ATM-0105254.

Affiliated with

Also associated with

No associations

Rating

MHD Turbulence in an Open Magnetic Region With Alfven Waves Weak Reflection. 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 MHD Turbulence in an Open Magnetic Region With Alfven Waves Weak Reflection., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and MHD Turbulence in an Open Magnetic Region With Alfven Waves Weak Reflection. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1435371