A revised graduated cylindrical shell model and its application to a prominence eruption

TL;DR

This study introduces a revised graduated cylindrical shell (GCS) model with deflection considerations, applied to a prominence eruption, revealing non-radial eruption behavior and detailed CME dynamics.

Contribution

The paper presents a modified GCS model accounting for prominence deflections, improving 3D reconstruction accuracy of eruptive prominences and associated CMEs.

Findings

Prominence accelerates from ~246 to ~708 km/s.

Prominence experiences 15° southward deflection.

CME speed is approximately 2.3 times the prominence speed.

Abstract

In this paper, the well-known graduated cylindrical shell (GCS) model is slightly revised by introducing longitudinal and latitudinal deflections of prominences originating from active regions (ARs). Subsequently, it is applied to the three-dimensional (3D) reconstruction of an eruptive prominence in AR 13110, which produced an M1.7 class flare and a fast coronal mass ejection (CME) on 2022 September 23. It is revealed that the prominence undergoes acceleration from $\sim$246 to $\sim$708 km s$^{-1}$. Meanwhile, the prominence experiences southward deflection by 15$\degr$$\pm$1$\degr$ without longitudinal deflection, suggesting that the prominence erupts non-radially. Southward deflections of the prominence and associated CME are consistent, validating the results of fitting using the revised GCS model. Besides, the true speed of the CME is calculated to be 1637$\pm$15 km s$^{-1}$, which is $\sim$2.3 times higher than that of prominence. This is indicative of continuing acceleration of the prominence during which flare magnetic reconnection reaches maximum beneath the erupting prominence. Hence, the reconstruction using the revised GCS model could successfully track a prominence in its early phase of evolution, including acceleration and deflection.