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The influence of magnetic field parameters and time step on deep learning models of solar flare prediction

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Abstract

The research on solar flare predicting holds significant practical and scientific value for safeguarding human activities. Current solar flare prediction models have not fully considered important factors such as time step length, nor have they conducted a comparative analysis of the physical features in multiple models or explored the consistency in the importance of features. In this work, based on SHARP data from SDO, we build 9 machine learning-based solar flare prediction models for binary “Yes” or “No” class prediction within the next 24 hours, and study the impact of different time steps and other factors on the forecasting performance. The main results are as follows. (1) The predictive performance of eight deep learning models shows an increasing trend as the time step length increases, and the models perform the best at the length of 40. (2) In predicting solar flares of ≥C class and ≥M class, the True Skill Statistic(TSS) of deep learning models consistently outperforms that of baseline model. For the same model, the TSS for predicting ≥M class flares generally exceeds that for predicting ≥C class flares. (3) The Brier Skill Score (BSS) of deep learning models significantly surpasses that of baseline model in predicting ≥C class flares. However, the BSS scores of the nine models are comparable for predicting ≥M class flares. For the same model, the BSS for predicting ≥C class flares is generally higher than that for predicting ≥M class flares. (4) Through feature importance analysis of multiple models, the common features that consistently rank at the top and bottom are identified.

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No datasets were generated or analysed during the current study.

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Acknowledgements

We express our gratitude to the anonymous reviewers whose insights and feedback have greatly enhanced the quality of this paper. Our acknowledgments also extend to the dedicated members of the SDO/HMI team for their contributions to the SDO mission.

Funding

This research received funding from the National Natural Science Foundation of China (Grants No. 11703009 and No. 11803010), the Natural Science Foundation of Jiangsu Province, China (Grants No. BK20170566 and No. BK20201199), National Natural Science Astronomy Joint Fund (No. U2031133), the Kunming Foreign (International) Cooperation Base Project (No. GHJD-2021022), and was supported by the Qing Lan Project.

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Jinfang Wei, Yanfang Zheng, and Xuebao Li wrote the main manuscript text. Changtian Xiang, Pengchao Yan, Xusheng Huang, Liang Dong and Hengrui Lou prepared tables and figures. Shuainan Yan, Hongwei Ye, Xuefeng Li, Shunhuang Zhang, Yexin Pan and Huiwen Wu participated in the manuscript writing and revision. Yanfang Zheng supervised the project.All authors reviewed the manuscript.

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Correspondence to Yanfang Zheng or Xuebao Li.

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Wei, J., Zheng, Y., Li, X. et al. The influence of magnetic field parameters and time step on deep learning models of solar flare prediction. Astrophys Space Sci 369, 48 (2024). https://doi.org/10.1007/s10509-024-04314-6

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