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�Data-Driven MHD Simulations and �Radiation Synthesis Tools

Yang Guo

School of Astronomy and Space Science

Nanjing University, China

2025 Mar 28

In collaboration with: Mingde Ding, Pengfei Chen, Chun Xia, Rony Keppens,

Jinhan Guo, Yiwei Ni, Wentai Fu, Ze Zhong

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Contents

  • Introduction
  • Data-Driven MHD Simulations
  • Radiation Synthesis Tools
  • Summary and Prospect

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Contents

  • Introduction
  • Data-Driven MHD Simulations
  • Radiation Synthesis Tools
  • Summary and Prospect

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Introduction

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Prominence (SDO/AIA 171, 211, 304 Å)

CME (SOHO/LASCO C3 White light)

Flare (TRACE 171 Å)

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Kleim et al. 2013, ApJ, 779, 129

Jiang et al. 2016, NatCo, 7, 11522

Inoue et al. 2018, NatCo, 9, 174

Amari et al. 2018, Nature, 554, 211

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NLFFF model

Nonlinear force-free field

MHD simulation

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Guo et al. 2019, ApJL, 870, 21

Zhong Z. et al. 2021, NatCo, 12, 2734

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Introduction

  •  

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Introduction

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Guo et al. 2024, RvMPP, 8, 29

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Introduction

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Magneto-Frictional Model

Alfvén Wave Solar Model (AWSoM)

Two-temperature with Alfvén wave heating

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Van der Holst et al. (2010)

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Introduction

Model 1

magnetic field extrapolations

Magneto-Frictional Module

LFFF

PFSS

Model 2

(semi-)analytic solutions

Regularized Biot-Savart Laws

Titov-Demoulin Model

……

Model 3

MHD simulations

Data-Driven MHD Simulations

Many other MHD Models

All three kinds of models have been implemented/realized in MPI-AMRVAC (Keppens

et al. 2012, 2023, Porth et al. 2014, Xia et al. 2018)

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Introduction

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MHD Simulation

Multi-wavelength Radiation

Radiation Synthesis

RST

https://github.com/fuwentai/radsyn_tools

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Contents

  • Introduction
  • Data-Driven MHD Simulations
    • Example 1
    • Example 2
    • Example 3
  • Radiation Synthesis Tools
  • Summary and Prospect

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Data-Driven MHD Simulations

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    • Extension from zero-beta model to a fully thermodynamic model

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radiation synthesis and comparison with observation

Guo J.H, 2023, ApJS, 266, 3

    • Extension from Cartesian to spherical coordinates

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simulation global scale of the Sun

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Guo Y., et al. 2023, ApJ, 958, 25

    • time-dependent magneto-frictional model + complete thermodynamic model

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simulation of the complete process of an active region from formation to eruption

Guo J.H., 2024, ApJ, 961, 140

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Contents

  • Introduction
  • Data-Driven MHD Simulations
    • Example 1
    • Example 2
    • Example 3
  • Radiation Synthesis Tools
  • Summary and Prospect

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Example 2: Observation and Model

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Example 2: Observation and Model

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Guo et al. 2012, ApJ, 760, 47

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Example 2: Observation and Model

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Guo et al. 2016, ApJ, 828, 83

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Example 2: Observation and Model

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Titov et al. 2018, ApJL, 852, 21

Guo Y., et al. 2023, ApJ, 958, 25

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Example 2: Observation and Model

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MPI-AMRVAC

https://github.com/amrvac

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Example 2: Observation and Model

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K-QSL

https://github.com/Kai-E-Yang/QSL

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Contents

  • Introduction
  • Data-Driven MHD Simulations
    • Example 1
    • Example 2
    • Example 3
  • Radiation Synthesis Tools
  • Summary and Prospect

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Radiation Synthesis Tools

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MHD Simulation

Multi-wavelength Radiation

Radiation Synthesis

Radiation Transfer Equation

Miscellaneous Techniques: coordinates, data structure, ray tracing, data interpolation, etc.

Physic Modules: white light, H, EUV, radio, pseudo-radiation

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Radiation Synthesis Tools

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RST

https://github.com/fuwentai/radsyn_tools

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Radiation Synthesis Tools

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300 MHz

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Radiation Synthesis Tools

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Radiation Synthesis Tools

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Radiation Synthesis Tools

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Contents

  • Introduction
  • Data-Driven MHD Simulations
    • Example 1
    • Example 2
    • Example 3
  • Radiation Synthesis Tools
  • Summary and Prospect

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Summary and Prospect

  1. We extended the zero-beta model to a fully thermodynamic model, incorporating more physics into the model to synthesize more realistic multi wavelength radiation and directly compare it with actual observations.
  2. By extending the magnetic flux rope model and MHD simulation from Cartesian coordinates to spherical coordinates, the simulation can be extended from the scale of the active region to the global scale of the Sun, thus achieving simulation on a large spatial scale;
  3. By combining the time-dependent magneto-frictional model and the complete thermodynamic model, it is possible to simulate the complete process of an active region from formation to eruption, thus achieving a simulation of physical time up to several days;
  4. We have developed a Python-based program, Radiation Synthesis Tools (RST), for integrating the radiation transfer equation solution. RST allows the synthesis of both optically thin and thick radiation from any desired perspective, in various wavebands, including, white light, Ha, Extreme Ultraviolet, radio, and pseudo-radiation proxy.

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Summary and Prospect

  • Coupling local and global models
  • Including more physics
  • Achieving higher accuracy of computation
  • Improving computational efficiency
  • Joint assessment of different codes

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Thank You!

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Contents

  • Introduction
  • Data-Driven MHD Simulations
    • Example 1
    • Example 2
    • Example 3
  • Radiation Synthesis Tools
  • Summary and Prospect

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Example 1: Observations

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X1.0 flare

2021 Oct 28

15:35 UT

NOAA 12887

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Example 1: Magnetic Field Model

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Example 1: Simulation

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Example 1: Simulation

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Example 1: Simulation

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Example 1: Simulation

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Contents

  • Introduction
  • Data-Driven MHD Simulations
    • Example 1
    • Example 2
    • Example 3
  • Radiation Synthesis Tools
  • Summary and Prospect

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Example 3: Model Equations

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Magneto-Frictional model

Full Thermo-Dynamic MHD model

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Example 3: Simulations

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Magneto-Frictional model

Guo J. H. et al. 2024, ApJ, 961, 140

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Example 3: Simulations

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Full Thermo-Dynamic MHD model

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Example 3: Simulations

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