English

Automatic Classification of Magnetic Chirality of Solar Filaments from H-Alpha Observations

Solar and Stellar Astrophysics 2025-09-24 v1 Artificial Intelligence

Abstract

In this study, we classify the magnetic chirality of solar filaments from H-Alpha observations using state-of-the-art image classification models. We establish the first reproducible baseline for solar filament chirality classification on the MAGFiLO dataset. The MAGFiLO dataset contains over 10,000 manually-annotated filaments from GONG H-Alpha observations, making it the largest dataset for filament detection and classification to date. Prior studies relied on much smaller datasets, which limited their generalizability and comparability. We fine-tuned several pre-trained, image classification architectures, including ResNet, WideResNet, ResNeXt, and ConvNeXt, and also applied data augmentation and per-class loss weights to optimize the models. Our best model, ConvNeXtBase, achieves a per-class accuracy of 0.69 for left chirality filaments and 0.730.73 for right chirality filaments.

Keywords

Cite

@article{arxiv.2509.18214,
  title  = {Automatic Classification of Magnetic Chirality of Solar Filaments from H-Alpha Observations},
  author = {Alexis Chalmers and Azim Ahmadzadeh},
  journal= {arXiv preprint arXiv:2509.18214},
  year   = {2025}
}