Compound eruptions of twin flux ropes in a solar active region

TL;DR

This paper investigates the compound eruptions of twin flux ropes in a solar active region, revealing how internal and external magnetic reconnections lead to a single flare and CME with two cores, highlighting complex magnetic interactions.

Contribution

It provides new insights into the magnetic reconnection processes and interactions between twin flux ropes during compound solar eruptions, linking magnetic dynamics to observed flare and CME features.

Findings

Two episodes of internal magnetic reconnections occurred within minutes.

Eruption of one flux rope accelerated the other and caused deflections.

External magnetic reconnection involved in the eruption of the second flux rope.

Abstract

Compound eruptions represent that multiple closely spaced magnetic structures erupt consecutively within a short interval, and then lead to a single flare and a single CME. However, it is still subtle for the links between multiple eruptions and the associated single flare or/and single CME. In this Letter, we report the compound eruptions of twin close flux ropes (FR1 and FR2) within a few minutes that resulted in a flare with a single soft X-ray peak and a CME with two cores. The successive groups of expanding loops and double peaks of intensity flux in AIA cool wavelengths indicate two episodes of internal magnetic reconnections during the compound eruptions. Following the eruption of FR2, the erupting FR1 was accelerated, and then the expanding loops overlying FR2 were deflected. Moreover, the eruption of FR2 likely involved the external magnetic reconnection between the bottom of the overlying stretching field lines and the rebounding loops that were previously pushed by the eruption of FR1, which was evidenced by a pair of groups of newly-formed loops. All results suggest that the compound eruptions involved both internal and external magnetic reconnections, and two erupting structures of twin FRs interacted at the initial stage. We propose that two episodes of internal magnetic reconnections were likely united within a few minutes to form the continuous impulsive phase of the single peaked flare, and two separated cores of the CME was possibly because that the latter core was too slow to merge with the former one.