A viable non-axisymmetric non-force-free field to represent solar active regions

TL;DR

This paper develops a non-axisymmetric, non-force-free magnetic field model using analytical and observational data to better represent solar active regions, showing good correlation with magnetograms.

Contribution

It introduces a new non-axisymmetric, non-force-free magnetic field model constructed from superposed linear-force-free fields, validated against solar magnetogram data.

Findings

The model correlates well with observed magnetograms.

Superposition of two linear-force-free fields effectively represents active regions.

The approach offers a viable alternative to force-free models for solar magnetic fields.

Abstract

A combination of analytical calculations and vectormagnetogram data are utilized to develop a non-axisymmetric non-force-free magnetic field and asses its viability in describing solar active regions. For the purpose, we construct a local spherical shell where a planar surface, tangential to the inner sphere, represents a Cartesian cutout of an active region. The magnetic field defined on the surface is then correlated with magnetograms. The analysis finds the non-axisymmetric non-force-free magnetic field, obtained by a superposition of two linear-force-free fields, correlates reasonably well with magnetograms.