On a solar blowout jet: driven mechanism and the formation of cool and hot components

TL;DR

This paper analyzes a solar blowout jet with two ejection stages, revealing how magnetic reconnection drives the formation of both cool and hot components, and providing detailed observational insights into the reconnection process.

Contribution

It presents detailed observations of a two-stage blowout jet, elucidating the driven mechanisms and formation of cool and hot components through magnetic reconnection.

Findings

Cool Hα jets appear before hot coronal jets by a few minutes.

Magnetic reconnection between confining loops and open fields causes jet ejections.

Reconnection features include bright patches, plasma blobs, and radio bursts.

Abstract

We present the observations of a blowout jet that experienced two distinct ejection stages. The first stage started from the emergence of a small positive magnetic polarity, which cancelled with the nearby negative magnetic field and caused the rising of a mini-filament and its confining loops. This further resulted in a small jet due to the magnetic reconnection between the rising confining loops and the overlying open field. The second ejection stage was mainly due to the successive removal of the confining field by the reconnection. Thus that the filament erupted and the erupting cool filament material directly combined with the hot jet originated form the reconnection region and therefore formed the cool and hot components of the blowout jet. During the two ejection stages, cool H{\alpha} jets are also observed cospatial with their coronal counterparts, but their appearance times are earlier than the hot coronal jets a few minutes. Therefore, the hot coronal jets are possibly caused by the heating of the cool H{\alpha} jets, or the rising of the reconnection height from chromosphere to the corona. The scenario that magnetic reconnection occurred between the confining loops and the overlying open loops are supported by many observational facts, including the bright patches on the both sides of the mini-filament, hot plasma blobs along the jet body, and periodic metric radio type III bursts at the very beginnings of the two stages. The evolution and characteristics of these features manifest the detailed non-linear process in the magnetic reconnection.