The fine dynamics in homologous and recurrent jets induced by persistent rising loops and mini-filaments

TL;DR

This study uses Solar Orbiter observations to analyze the detailed fine dynamics of recurrent solar jets driven by persistent rising loops and mini-filaments interacting with a fan-spine structure, revealing new insights into their eruption mechanisms.

Contribution

It provides the first detailed high-resolution analysis of the interactions between rising loops, mini-filaments, and fan-spine structures in recurrent solar jets.

Findings

Over 22 ejections observed with speeds up to 186 km/s.

Brightenings and current sheets form near footpoints during eruptions.

Outflow regions and bright blobs show characteristic speeds and widths.

Abstract

Jets are common eruptive phenomena in the solar atmosphere which may occur repeatedly. Many studies of their fine dynamics have been conducted. However, the fine dynamics of persistent interactions among various features that drive recurrent coronal jets have not been studied in detail. In this paper, we use observations from the Solar Orbiter to report persistent interactions between rising loops/mini-filaments and a fan-spine-like structure, which produced more than 22 ejections. Many loops and mini-filaments under the fan-spine-like structure rose with speeds of $8 - 58\,\mathrm{km~s^{-1}}$ and an average of $27\,\mathrm{km~s^{-1}}$. These rising loops and mini-filaments interacted with the fan-spine-like structure successively, producing ejections with speeds ranging from 25 to 186\,\rm km\,s$^{-1}$ and an average at $80\,\rm km~s^{-1}$. We observed the fine dynamics of the drivers of these recurrent jets in detail, including partial eruption of mini-filaments, formation of a new mini-filament by contraction of remaining threads from the partially-erupted mini-filament, and interaction between rising loops (or mini-filaments) and the fan-spine-like structure. Brightenings appeared near the footpoint of these rising structures, followed by the formation of current sheets. Some arcades at the outflow region contracted with speeds of around $10\,\rm km~s^{-1}$, and the outflow region moved at around $8\,\rm km~s^{-1}$ toward the opposite direction. Bright blobs were observed in the current sheets, and they propagated at speeds averaging at $21\,\rm km\,s^{-1}$ and had an average width of 296\,km. We emphasize the vital roles of persistent rising loops and/or mini-filaments in producing recurrent jets by interacting with the fan-like structure, and show their detailed dynamics with unprecedentedly-high-resolution observations.