用深度学习预测太阳风暴是否影响地球,准确率超80%
Prediction of Geoeffective CMEs Using SOHO Images and Deep Learning
- 基于SOHO卫星图像,用深度学习提取日冕物质抛射特征
- 确定性预测下相关系数达0.807,概率预测误差仅0.094
- 适合空间天气预报、航天器保护等关键领域使用
机器学习在日冕物质抛射(CME)及其对地球影响的研究中应用日益广泛。理解并预测CME的地球效应对于保护太空基础设施和保障地面技术系统韧性至关重要。本文提出GeoCME,一种深度学习框架,可对抵达地球的CME事件是否引发地磁暴进行确定性或概率性预测。地磁暴定义为Dst指数最低值低于-50 nT的扰动。GeoCME基于太阳和日球层观测台(SOHO)上LASCO C2、EIT和MDI仪器的数据训练,聚焦于太阳周期23中的136个全晕/部分晕型CME数据集。通过集成学习与迁移学习技术,模型能从SOHO观测中提取隐藏特征并做出预测。实验结果显示,作为确定性预测模型时,GeoCME达到0.807的马修斯相关系数和0.714的真实技能统计得分;作为概率预测模型时,其贝叶斯评分(Brier score)为0.094,贝叶斯技能评分(Brier skill score)为0.493。结果表明,该方法有望提升我们对日地相互作用机制的理解。
原文摘要 · Abstract (English)
The application of machine learning to the study of coronal mass ejections (CMEs) and their impacts on Earth has seen significant growth recently. Understanding and forecasting CME geoeffectiveness is crucial for protecting infrastructure in space and ensuring the resilience of technological systems on Earth. Here we present GeoCME, a deep-learning framework designed to predict, deterministically or probabilistically, whether a CME event that arrives at Earth will cause a geomagnetic storm. A geomagnetic storm is defined as a disturbance of the Earth's magnetosphere during which the minimum Dst index value is less than -50 nT. GeoCME is trained on observations from the instruments including LASCO C2, EIT and MDI on board the Solar and Heliospheric Observatory (SOHO), focusing on a dataset that includes 136 halo/partial halo CMEs in Solar Cycle 23. Using ensemble and transfer learning techniques, GeoCME is capable of extracting features hidden in the SOHO observations and making predictions based on the learned features. Our experimental results demonstrate the good performance of GeoCME, achieving a Matthew's correlation coefficient of 0.807 and a true skill statistics score of 0.714 when the tool is used as a deterministic prediction model. When the tool is used as a probabilistic forecasting model, it achieves a Brier score of 0.094 and a Brier skill score of 0.493. These results are promising, showing that the proposed GeoCME can help enhance our understanding of CME-triggered solar-terrestrial interactions.
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