Jet formation in solar atmosphere due to magnetic reconnection

TL;DR

This study uses numerical resistive MHD simulations to demonstrate that magnetic reconnection in the solar atmosphere can produce jets resembling type II spicules and cold coronal jets, with properties depending on magnetic field configurations.

Contribution

It introduces a detailed modeling of jet formation via magnetic reconnection in the chromosphere-corona region using a 2.5D approach with specific magnetic field and resistivity parameters.

Findings

Jets with velocities up to several hundred km/s are produced.

Jet morphology and inclination depend on magnetic field symmetry.

Reconnection triggers high-speed jet formation consistent with observed solar phenomena.

Abstract

Using numerical simulations, we show that jets with features of type II spicules and cold coronal jets corresponding to temperatures $10^{4}$ K can be formed due to magnetic reconnection in a scenario in presence of magnetic resistivity. For this we model the low chromosphere-corona region using the C7 equilibrium solar atmosphere model and assuming Resistive MHD rules the dynamics of the plasma. The magnetic filed configurations we analyze correspond to two neighboring loops with opposite polarity. The separation of the loops' feet determines the thickness of a current sheet that triggers a magnetic reconnection process, and the further formation of a high speed and sharp structure. We analyze the cases where the magnetic filed strength of the two loops is equal and different. In the first case, with a symmetric configuration the spicules raise vertically whereas in an asymmetric configuration the structure shows an inclination. With a number of simulations carried out under a 2.5D approach, we explore various properties of excited jets, namely, the morphology, inclination and velocity. The parameter space involves magnetic field strength between 20 and 40 G, and the resistivity is assumed to be uniform with a constant value of the order $10^{-2}\Omega\cdot m$