Recurrent coronal jets observed by SDO/AIA

TL;DR

This study analyzes three recurrent coronal jets observed by SDO/AIA, revealing their magnetic reconnection origin, different acceleration behaviors, and potential external forces influencing their propagation.

Contribution

It provides detailed multiwavelength observations of recurring jets, highlighting the role of magnetic reconnection and identifying possible external forces affecting jet dynamics.

Findings

Jet2's initial velocity is 402 km/s.

Jet2 experiences asymmetric accelerations, suggesting external forces.

Jet3's constant acceleration indicates minimal external influence.

Abstract

In this paper, we carry out multiwavelength observations of three recurring jets on 2014 November 7. The jets originated from the same region at the edge of AR 12205 and propagated along the same coronal loop. The eruptions were generated by magnetic reconnection, which is evidenced by continuous magnetic cancellation at the jet base. The projected initial velocity of the jet2 is 402 km s. The accelerations in the ascending and descending phases of jet2 are not consistent, the former is considerably larger than the value of solar gravitational acceleration at the solar surface, while the latter is lower than solar gravitational acceleration. There are two possible candidates of extra forces acting on jet2 during its propagation. One is the downward gas pressure from jet1 when it falls back and meets with jet2. The other is the viscous drag from the surrounding plasma during the fast propagation of jet2. As a contrast, the accelerations of jet3 in the rising and falling phases are constant, implying that the propagation of jet3 is not significantly influenced byextra forces.