Authors: M S Ruderman E Pelinovsky N S Petrukhin T Talipova
Publish Date: 2013/03/20
Volume: 286, Issue: 2, Pages: 417-426
Abstract
Propagating kink waves are ubiquitously observed in solar magnetic wave guides We consider the possibility that these waves propagate without reflection although there is some inhomogeneity We briefly describe the general theory of nonreflective onedimensional wave propagation in inhomogeneous media This theory is then applied to kinkwave propagation in coronal loops We consider a coronal loop of halfcircle shape embedded in an isothermal atmosphere and assume that the plasma temperature is the same inside and outside the loop We show that nonreflective kinkwave propagation is possible for a particular dependence of the loop radius on the distance along the loop A viable assumption that the loop radius increases from the loop footpoint to the apex imposes a lower limit on the loop expansion factor which is the ratio of the loop radii at the apex and footpoints This lower limit increases with the loop height however even for a loop that is twice as high as the atmospheric scale height it is small enough to satisfy observational constraints Hence we conclude that nonreflective propagation of kink waves is possible in a fairly realistic model of coronal loops
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