| Abstract : | Solar cool jets are high-velocity ejecta that are impulsive and collimated plasma motions along the magnetic field lines in the Sun’s atmosphere. Small-scale cool jets (T<0.1 MK) and associated plasma dynamics have been detected in multiwavelength observations using various ground and space-borne instruments. We describe our few extensive MHD models in ideal and non-ideal regimes of plasma that demonstrate origin and evolution of these cool jets and associated plasma processes. Our findings are consistent with various observations of cool solar jets. These scientific findings are helpful in understanding the intricate relationship between plasma flows and complex structuring of the magnetic field leading to the evolution of various triggering processes of these jets in the solar atmosphere. This also provides clues of their significant role in energy and mass transport into the lower solar corona. Specifically, we address the formation of such spicule-like cool jets and associated plasma dynamics using 2-D and 2.5-D MHD modelling using Alfvén pulses, pressure pulses and vertical velocity pulses. The triggering mechanism (driver), dynamical evolution, kinematics, and energetics of such cool jets in the solar atmosphere are investigated. We find that transported mass flux and kinetic energy density during jet’s evolution are significant to fulfill the localized coronal losses. The non-adiabatic conditions (e.g., thermal-conduction and radiative-cooling) specifically affect the jet propagation, mass flux, and kinetic energy density. In addition, one case of our MHD simulation demonstrates the evolution of cool jets under the complex velocity field, which also exhibit decaying kink oscillation. We describe that the curvature and radial structuring of the Alfvén speed and density within these jets most likely cause dissipation of these transversal oscillations. At the end, we describe the evolution of Kelvin-Helmholtz instability in the large-scale cool jet-like structure using EUV observations taken from SDO/AIA. |
