Splitting and eruption of an active region filament caused by magnetic reconnection

TL;DR

This study investigates how magnetic reconnection triggers the splitting and eruption of an active region filament, providing detailed multi-wavelength observations that reveal the process and its implications for filament formation.

Contribution

It presents a detailed case study demonstrating magnetic reconnection as the trigger for filament splitting and eruption, enhancing understanding of filament dynamics and formation.

Findings

Magnetic reconnection caused filament splitting and successive eruptions.

Brightening, bidirectional jet, and dimmings observed as evidence of reconnection.

Failed eruptions of the new filaments suggest complex eruption mechanisms.

Abstract

To gain a deeper understanding of the intricate process of filament eruption, we present a case study of a filament splitting and eruption by using multi-wavelength data of the Solar Dynamics Observatory (SDO). It is found that the magnetic reconnection between the filament and the surrounding magnetic loops resulted in the formation of two new filaments, which erupted successively. The observational evidences of magnetic reconnection, such as the obvious brightening at the junction of two different magnetic structures, the appearance of a bidirectional jet, and subsequent filament splitting, were clearly observed. Even though the two newly formed filaments experienced failed eruptions, three obvious dimmings were observed at the footpoints of the filaments during their eruptions. Based on these observations, it is suggested that magnetic reconnection is the trigger mechanism for the splitting of the original filament and the subsequent eruption of the newly formed filaments. Furthermore, the process of filament splitting dominated by magnetic reconnection can shed light on the explanation of double-deck filament formation.