Plasmoid ejections driven by dynamo action underneath a spherical surface

TL;DR

This paper introduces a 3D spherical model of the Sun's convection zone and atmosphere, demonstrating that dynamo-generated magnetic fields can produce recurrent plasmoid ejections and large magnetic structures without magnetic buoyancy.

Contribution

It presents a novel 3D spherical model showing dynamo-driven magnetic field emergence and plasmoid ejections without relying on magnetic buoyancy.

Findings

Recurrent plasmoid ejections observed in the model

Magnetic clouds formed from transported current helicity

Magnetic fields emerge without magnetic buoyancy

Abstract

We present a unified three-dimensional model of the convection zone and upper atmosphere of the Sun in spherical geometry. In this model, magnetic fields, generated by a helically forced dynamo in the convection zone, emerge without the assistance of magnetic buoyancy. We use an isothermal equation of state with gravity and density stratification. Recurrent plasmoid ejections, which rise through the outer atmosphere, is observed. In addition, the current helicity of the small--scale field is transported outwards and form large structures like magnetic clouds.