Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes

Details Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes

2007-10-17

arxiv.org/abs/0710.3335v2

Astronomy and Astrophysics

Astrophysics

22 pages 6 color figures, submitted to Solar Physics, proceeding of SOHO 19/ GONG 2007 meeting, Melbourne, Australia

Scientific paper

10.1007/s11207-008-9133-8

We present results of non-linear, 2D, numerical simulations of magneto-acoustic wave propagation in the photosphere and chromosphere of small-scale flux tubes with internal structure. Waves with realistic periods of three to five minutes are studied, after applying horizontal and vertical oscillatory perturbations to the equilibrium model. Spurious reflections of shock waves from the upper boundary are minimized thanks to a special boundary condition. This has allowed us to increase the duration of the simulations and to make it long enough to perform a statistical analysis of oscillations. The simulations show that deep horizontal motions of the flux tube generate a slow (magnetic) mode and a surface mode. These modes are efficiently transformed into a slow (acoustic) mode in the vA < cS atmosphere. The slow (acoustic) mode propagates vertically along the field lines, forms shocks and remains always within the flux tube. It might deposit effectively the energy of the driver into the chromosphere. When the driver oscillates with a high frequency, above the cut-off, non-linear wave propagation occurs with the same dominant driver period at all heights. At low frequencies, below the cut-off, the dominant period of oscillations changes with height from that of the driver in the photosphere to its first harmonic (half period) in the chromosphere. Depending on the period and on the type of the driver, different shock patterns are observed.

Affiliated with

Also associated with

No associations

Rating

Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes 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 Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-linear numerical simulations of magneto-acoustic wave propagation in small-scale flux tubes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-12167