Helical Blowout Jets in the Sun: Untwisting and Propagation of Waves

TL;DR

This paper presents a numerical study of helical blowout jets in the Sun, demonstrating their velocities, plasma transfer, untwisting motion, and the propagation of torsional Alfvén waves during jet emission.

Contribution

It provides the first direct evidence linking the untwisting motion of blowout jets to torsional Alfvén wave propagation in the solar corona.

Findings

Jets reach velocities of 100-250 km/s.

Jets transfer significant heavy plasma into the outer atmosphere.

Untwisting motion is associated with torsional Alfvén waves.

Abstract

We report on numerical experiment of the recurrent onset of helical "blowout" jets in an emerging flux region (EFR). We find that these jets are running with velocities of $\sim 100-250\,\mathrm{kms^{-1}}$ and they transfer a vast amount of heavy plasma into the outer solar atmosphere. During their emission, they undergo an untwisting motion as a result of reconnection between the twisted emerging and the non-twisted pre-existing magnetic field in the solar atmosphere. For the first time in the context of blowout jets, we provide a direct evidence that their untwisting motion is associated with the propagation of torsional Alfv\'en waves in the corona.