Simulation of a Solar Jet Formed from an Untwisting Flux Rope Interacting with a Null Point

Coronal jets are eruptions identified by a collimated, sometimes twisted spire. They small-scale energetic events compared with flares. Using multi-wavelength observations from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) and magnetogram Hinode/Spectro-Polarimeter (Hinode/SP), we study formation evolution of jet occurring on 2019 March 22 in active region NOAA 12736. A zero-$\beta$ magnetohydrodynamic (MHD) simulation is conducted to probe initiation mechanisms appearance helical motion during this event. As reveals, there two pairs field lines at base, indicating distinct magnetic structures. One structure outlines flux rope lying low above photosphere north bald patch other shows null point high corona south. The untwisting motions observed was recovered adding an anomalous (artificial) resistivity simulation. reconnection occurs structure, which moving upwards simultaneously encounters structure. interaction structures results while twist transferred reconnected lines. rotational proposed be underlying trigger process responsible for