A time-dependent model for magnetic reconnection in the presence of a separator

TL;DR

This paper introduces a time-dependent model for separator magnetic reconnection, revealing how isolated reconnection can generate multiple separators and complex flux systems, relevant for solar and magnetospheric phenomena.

Contribution

The paper develops a novel model for separator reconnection that accounts for multiple separators and flux complexity, aligning with numerical simulation observations.

Findings

Reconnection above a threshold creates new separators.

Multiple separators lead to complex magnetic flux systems.

The model aligns with numerical simulation results.

Abstract

We present a model for separator reconnection due to an isolated reconnection process. Separator reconnection is a process which occurs in the neighbourhood of a distinguished field line (the separator) connecting two null points of a magnetic field. It is, for example, important for the dynamics of magnetic flux at the dayside magnetopause and in the solar corona. We find that, above a certain threshold, such a reconnection process generates new separators which leads to a complex system of magnetic flux tubes connecting regions of previously separated flux. Our findings are consistent with the findings of large numbers of separators in numerical simulations. We discuss how to measure and interpret the reconnection rate in a configuration with multiple separators.