Initiation and Eruption Process of Magnetic Flux Rope from Solar Active Region NOAA 11719 to Earth Directed-CME

TL;DR

This study investigates the initiation and eruption of a magnetic flux rope from solar active region NOAA 11719, linking magnetic field evolution, instability mechanisms, and the resulting Earth-directed CME.

Contribution

It provides detailed analysis of magnetic flux evolution, flux rope dynamics, and instability triggers leading to CME initiation from NOAA 11719.

Findings

Flux rope exhibited kink-rise evolution and increased temperature during eruption.

Magnetic flux cancellation and current increase contributed to flux rope instability.

The eruption was associated with a M6.5 flare and an Earth-directed CME.

Abstract

An eruption event launched from solar active region (AR) NOAA 11719 is investigated based on coronal EUV observations and photospheric magnetic field measurements obtained from Solar Dynamic Observatory. The AR consists of a filament channel originating from major sunspot and its south section is associated with inverse-S sigmoidal system as observed in AIA passbands. We regard the sigmoid as the main body of the flux rope (FR). There also exists a twisted flux bundle crossing over this FR. This overlying flux bundle transforms in shape similar to kink-rise evolution which has correspondence with rise motion of the FR. The emission measure and temperature along the FR exhibits increasing trend with its rising motion, indicating reconnection in the thinning current sheet underneath the FR. Net magnetic flux of the AR evaluated at north and south polarities showed decreasing behavior whereas the net current in these fluxes exhibits increasing trend. As the negative (positive) flux is having dominant positive (negative) current, the chirality of AR flux system is likely negative (left handed) to be consistent with the chirality of inverse S-sigmoidal FR. This analysis of magnetic fields of source AR suggest that the cancelling fluxes are prime factors to the monotonous twisting of the FR system reaching to a critical state to trigger kink instability and the rise motion. This rise motion possibly led to onset of torus instability resulting in Earth-directed CME and the progressive reconnection in thinning current sheet underneath the rising FR leads to M6.5 flare.