Homologous Accelerated Electron Beams, Quasi-periodic fast-propagating Wave and CME Observed in one Fan-spine Jet

TL;DR

This study investigates a solar jet event involving homologous electron beams, a quasi-periodic wave train, and a jet-like CME within a fan-spine magnetic system, revealing the magnetic reconnection processes and electron acceleration mechanisms involved.

Contribution

It provides a detailed analysis of the magnetic topology and electron acceleration processes in a fan-spine jet, linking radio bursts, wave trains, and CME formation with magnetic reconnection.

Findings

Both radio bursts and electron beams are caused by magnetic reconnection.

The jet bifurcates into two branches with different fates.

The observed phenomena are explained by the fan-spine magnetic system.

Abstract

Using imaging and radio multi-wavelength observations, we studied the origin of two homologous accelerated electron beams and a quasi-periodic fast-propagating (QFP) wave train associated with a solar jet on 2012 July 14. The jet occurred in a small-scale fan-spine magnetic system embedding in a large-scale pseudostreamer, which associated with a GOES C1.4 flare, a jet-like coronal mass ejection (CME), a type II radio burst, and a type III radio burst. During the initial stage, a QFP wave train and a fast moving on-disk radio source were detected in succession ahead of the jet along the outer spine of the fan-spine system. When the jet reached a height of about 1.3 solar radii, it underwent a bifurcation into two branches. Based on our analysis results, all the observed phenomena in association with the jet can be explained by using a fan-spine magnetic system. We propose that both the type III radio burst and the on-disk fast moving radio source were caused by the same physical process, i.e., the energetic electrons accelerated by the magnetic reconnection at the null point, and they were along the open field lines of the pseudostreamer and the closed outer spine of the fan-spine structure, respectively. Due to the bifurcation of the jet body, the lower branch along the closed outer spine of the fan-spine structure fell back to the solar surface, while the upper branch along the open field lines of the pseudostreamer caused the jet-like CME in the outer corona.