Linear MHD Sausage Waves in Compressible Magnetically Twisted Flux Tubes

Details Linear MHD Sausage Waves in Compressible Magnetically Twisted Flux Tubes Linear MHD Sausage Waves in Compressible Magnetically Twisted Flux Tubes

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..246..101e&link_type=abstract

Solar Physics, Volume 246, Issue 1, pp.101-118

Physics

12

Twisted Magnetic Flux Tube, Mhd Waves, Solar Atmosphere, Magneto-Seismology

Scientific paper

Oscillations of magnetic flux tubes are of great importance as they contain information about the geometry and fine structure of the flux tubes. Here we derive and analytically solve in terms of Kummer’s functions the linear governing equations of wave propagation for sausage surface and body modes ( m=0) of a magnetically twisted compressible flux tube embedded in a compressible uniformly magnetized plasma environment in cylindrical geometry. A general dispersion relation is obtained for such flux tubes. Numerical solutions for the phase velocity are obtained for a wide range of wavenumbers and for varying magnetic twist. The effect of magnetic twist on the period of oscillations of sausage surface modes for different values of the wavenumber and vertical magnetic field strength is calculated for representative photospheric and coronal conditions. These results generalize and extend previous studies of MHD waves obtained for incompressible or for compressible but nontwisted flux tubes. It is found that magnetic twist may change the period of sausage surface waves of the order of a few percent when compared to counterparts in straight nontwisted flux tubes. This information will be most relevant when high-resolution observations are used for diagnostic exploration of MHD wave guides in analogy to solar-interior studies by means of global eigenoscillations in helioseismology.

Affiliated with

Also associated with

No associations

Rating

Linear MHD Sausage Waves in Compressible Magnetically Twisted 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 Linear MHD Sausage Waves in Compressible Magnetically Twisted Flux Tubes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear MHD Sausage Waves in Compressible Magnetically Twisted Flux Tubes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1546821