# Recurrent CME-like Eruptions in Emerging Flux Regions. II. Scaling of Energy and Collision of Successive Eruptions

## TL;DR

This study uses 3D MHD simulations to analyze recurrent eruptions in emerging flux regions, revealing how eruption energies scale with magnetic field strength and how successive eruptions interact through magnetic reconnection and merging.

## Contribution

It provides a parametric analysis of eruption energies and demonstrates the initial stages of eruption collision and merging in emerging flux regions.

## Key findings

- Eruption energies range from 10^26 to 10^28 erg, similar to small CMEs.
- Eruptions are triggered earlier with higher magnetic field strength.
- Partial merging of eruptions occurs via magnetic reconnection and tether-cutting processes.

## Abstract

We present results of three-dimensional MHD simulations of recurrent eruptions in emerging flux regions. The initial numerical setup is the same with the work by Syntelis et al. 2017 (hereafter, Paper I). Here, we perform a parametric study on the magnetic field strength ($B_0$) of the emerging field. The kinetic energy of the produced ejective eruptions in the emerging flux region ranges from $10^{26}-10^{28}$ erg, reaching up to the energies of small Coronal Mass Ejections (CMEs). The kinetic and magnetic energies of the eruptions scale linearly in a logarithmic plot. We find that the eruptions are triggered earlier for higher $B_0$ and that $B_0$ is not directly correlated to the frequency of occurrence of the eruptions. Using large numerical domains, we show the initial stage of the partial merging of two colliding erupting fields. The partial merging occurs partly by the reconnection between the field lines of the following and the leading eruption at the interface between them. We also find that tether-cutting reconnection of the field lines of the leading eruption underneath the following eruption magnetically links the two eruptions. Shocks develop inside the leading eruption during the collision.