Study of nonlinear MHD equations governing the wave propagation in twisted coronal loops

Details Study of nonlinear MHD equations governing the wave propagation in twisted coronal loops Study of nonlinear MHD equations governing the wave propagation in twisted coronal loops

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...28p&link_type=abstract

Katholieke Univ. te Leuven, International Solar Wind 8 Conference, p. 28

Mathematics

Coronal Loops, Magnetohydrodynamic Waves, Solar Corona, Nonlinear Equations, Plasma Slabs, Wave Propagation, Photosphere, Nonuniform Magnetic Fields, Magnetic Field Configurations, Magnetic Flux, Singularity (Mathematics), Propagation Modes

Scientific paper

The solar corona, modelled by a low beta, resistive plasma slab, sustains MHD wave propagations due to shearing footpoint motions in the photosphere. By using a numerical algorithm the excitation and nonlinear development of MHD waves in twisted coronal loops are studied. The plasma responds to the footpoint motion by sausage waves if there is no twist. The twist in the magnetic field of the loop destroys initially developed sausage-like wave modes and they become kinks. The transition from sausage to kink modes is analyzed. The twist brings about mode degradation producing high harmonics and this generates more complex fine structures. This can be attributed to several local extrema in the perturbed velocity profiles. The Alfven wave produces remnants of the ideal 1/x singularity both for zero and non-zero twist and this pseudo-singularity becomes less pronounced for larger twist. The effect of nonlinearity is clearly observed by changing the amplitude of the driver by one order of magnitude. The magnetosonic waves also exhibit smoothed remnants of ideal logarithmic singularities when the frequency of the driver is correctly chosen. This pseudo-singularity for fast waves is absent when the coronal loop does not undergo any twist but becomes pronounced when twist is included. On the contrary, it is observed for slow waves even if there is no twist. Increasing the twist leads to a higher heating rate of the loop. The larger twist shifts somewhat uniformly distributed heating to layers inside the slab corresponding to peaks in the magnetic field strength.

Affiliated with

Also associated with

No associations

Rating

Study of nonlinear MHD equations governing the wave propagation in twisted coronal loops 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 Study of nonlinear MHD equations governing the wave propagation in twisted coronal loops, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of nonlinear MHD equations governing the wave propagation in twisted coronal loops will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-759737