Torsional Alfven waves in stratified and expanding magnetic flux tubes

Abstract

The effects of both density stratification and magnetic field expansion on torsional Alfven waves in magnetic flux tubes are studied. The frequencies, the period ratio P1/P2 of the fundamental and its first-overtone, and eigenfunctions of torsional Alfven modes are obtained. Our numerical results show that the density stratification and magnetic field expansion have opposite effects on the oscillating properties of torsional Alfven waves.

arXiv comment13 pages, 7 figures, Accepted for publication in Astrophysics and Space Science

References in corpus (9)

• Alfven Waves in the Lower Solar Atmosphere
• On the nature of kink MHD waves in magnetic flux tubes
• Observation of coronal loop torsional oscillation
• Torsional oscillations of longitudinally inhomogeneous coronal loops
• Enhanced phase mixing of Alfvén waves propagating in stratified and divergent coronal structures
• The effect of twisted magnetic field on the resonant absorption of MHD waves in coronal loops
• Phase-Mixing and Dissipation of Standing Shear Alfven waves
• Resonant absorption in dissipative flux tubes
• The effect of density stratification on the resonant absorption of MHD waves in coronal loops

Cited by in corpus (5)

• The Source of Three-minute Magneto-acoustic Oscillations in Coronal Fans
• The Effect of Twisted Magnetic Field on the Period Ratio P_1/P_2 of Nonaxisymmetric MHD Waves
• Torsional Alfvénic Oscillations Discovered in the Magnetic Free Energy During Solar Flares
• Torsional Alfven waves and the period ratio P_1/P_2 in spicules
• The period ratio P_1/P_2 of torsional Alfvén waves with steady flows in spicules