Abstract


  FLUTE MODES IN TWISTED FLUX TUBES WITH UNIFORM FLOWS

  S. Anantharaman, Indian Institute of Astrophysics, satya@iiap.res.in
  V. Pandey, National Institute of Technology, New Delhi 110040, pandey_vs@yahoo.com

Magnetic Fields and Waves play an important role in the dynamics of the atmosphere of the Sun, in particular, the corona. Flux tubes act as channels for the transfer of energy from the photosphere to the corona. In an ideal MHD, which is compressible and homogeneous, three types of modes, namely the Alfven, the Fast and the Slow magnetoacoustic modes can be excited. However, the atmosphere of the Sun is highly non-homogeneous and the magnetic fields manifest in terms of flux tubes. In this work, we study the higher order modes in a cylindrical flux tube (m = 2) with an uniform twist (magnetic field) and uniform flows. To begin with, we solve the dispersion relation for the simple case of an incompressible flow and discuss the dispersive characteristics for different normalized phase speed as a function of the normalized uniform flow. The case of the compressible flow will be taken up
later.