The magnetic field in the solar atmosphere

T Wiegelmann, JK Thalmann, SK Solanki - The Astronomy and …, 2014 - Springer
This publication provides an overview of magnetic fields in the solar atmosphere with the
focus lying on the corona. The solar magnetic field couples the solar interior with the visible …

Magnetic helicity, tilt, and twist

AA Pevtsov, MA Berger, A Nindos, AA Norton… - Space Science …, 2014 - Springer
Since its introduction to astro-and solar physics, the concept of helicity has proven to be
useful in providing critical insights into physics of various processes from astrophysical …

Time-dependent data-driven modeling of active region evolution using energy-optimized photospheric electric fields

J Pomoell, E Lumme, E Kilpua - Solar Physics, 2019 - Springer
In this work, we present results of a time-dependent data-driven numerical simulation
developed to study the dynamics of coronal active region magnetic fields. The evolving …

Origin and structures of solar eruptions II: Magnetic modeling

Y Guo, X Cheng, MD Ding - Science China Earth Sciences, 2017 - Springer
The topology and dynamics of the three-dimensional magnetic field in the solar atmosphere
govern various solar eruptive phenomena and activities, such as flares, coronal mass …

Threshold of non-potential magnetic helicity ratios at the onset of solar eruptions

FP Zuccarello, E Pariat, G Valori… - The Astrophysical …, 2018 - iopscience.iop.org
The relative magnetic helicity is a quantity that is often used to describe the level of
entanglement of non-isolated magnetic fields, such as the magnetic field of solar active …

Relative magnetic helicity as a diagnostic of solar eruptivity

E Pariat, JE Leake, G Valori, MG Linton… - Astronomy & …, 2017 - aanda.org
Context. The discovery of clear criteria that can deterministically describe the eruptive state
of a solar active region would lead to major improvements on space weather predictions …

A Study of Preflare Solar Coronal Magnetic Fields: Magnetic Energy and Helicity

A Duan, C Jiang, X Feng - The Astrophysical Journal, 2023 - iopscience.iop.org
Solar flares fall into two types, with eruptive ones associated with coronal mass ejection
(CME) and confined ones without CME. To explore whether there are preflare conditions in …

Data-driven, time-dependent modeling of pre-eruptive coronal magnetic field configuration at the periphery of NOAA AR 11726

E Lumme, J Pomoell, DJ Price, EKJ Kilpua… - Astronomy & …, 2022 - aanda.org
Context. Data-driven, time-dependent magnetofrictional modeling has proved to be an
efficient tool for studying the pre-eruptive build-up of energy for solar eruptions, and …

The influence of spatial resolution on nonlinear force-free modeling

ML DeRosa, MS Wheatland, KD Leka… - The Astrophysical …, 2015 - iopscience.iop.org
The nonlinear force-free field (NLFFF) model is often used to describe the solar coronal
magnetic field, however a series of earlier studies revealed difficulties in the numerical …

Magnetic helicity estimations in models and observations of the solar magnetic field. IV. Application to solar observations

JK Thalmann, MK Georgoulis, Y Liu… - The Astrophysical …, 2021 - iopscience.iop.org
In this ISSI-supported series of studies on magnetic helicity in the Sun, we systematically
implement different magnetic helicity calculation methods on high-quality solar …