Author: T.V. Zaqarashvili1, S. Lomineishvili,  P. Leitner, A. Hanslmeier, P. Gömöry, M. Roth

Date: April 28th, 2021 (10:00 am) - online

Title: Kink instability of triangular jets in the solar atmosphere

Abstract: It is known that hydrodynamic jets are unstable to the anti-symmetric kink perturbations.
         The instability is depended on the Alfvén Mach number (the ratio of flow speed and Alfvén speed)
         and the ratio of internal and external densities, but inclusion of magnetic field can become the
         stabilization factor. We study such cases as kink instabilities for solar triangular jets
         (the jets with maximal velocity at its axis, which linearly decreases at both sides).
         The model is presented as triangular jets sandwiched between magnetic tubes/slabs and we look for
         possible explaining observed properties of the jets in the solar atmosphere.
         For this, the MHD equations is solved analytically (the dispersion relation is obtained) and numerically
         (in fully nonlinear case) for various settings  especially, for a particular situation of solar
         type II Spicules. Herewith, relative importance of these different factors is considered.