Evaluating Auroral Forecasts Against Satellite Observations

Evaluating Auroral Forecasts Against Satellite Observations
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根据卫星观测评估极光预报

DOI:
10.1029/2020sw002688
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发表时间:
2021
期刊:
影响因子:
3.7
通讯作者:
Mooney M
Mooney M
中科院分区:
地球科学1区
文献类型:
--
作者:
Mooney M

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极光是许多公众感兴趣的显而易见的现象。然而,极光和相关现象也会严重影响通信、地面基础设施和高空辐射暴露。因此,预测极光椭圆区的位置是空间天气预报业务的关键组成部分。英国气象局空间天气运行中心 (MOSWOC) 使用了 OVATION‐Prime 2013 极光降水模型的一个版本(Newell 等人,2014 年,https://doi.org/10.1002/2014sw001056)。英国气象局 OVATION‐Prime 2013 模型的运行实施提供了 30 分钟的极光椭圆形位置和观测极光概率的预测。我们使用天气预报评估技术,通过将预测与根据 2000 年至 2002 年 IMAGE 卫星数据确定的极光边界进行比较,评估 OVATION-Prime 2013 模型预测极光发生位置和概率的能力。我们的分析表明,该运行模型在预测极光椭圆形位置方面表现良好,相对运行特征 (ROC) 得分为 0.82。模型性能在白天当地时间区域(ROC 分数 = 0.59)和地磁活动较高期间(Kp = 8 的 ROC 分数为 0.55)会降低。作为概率预测,OVATION-Prime 2013 往往会低估极光发生的 1.1-6 倍,而超过 90% 的概率则被高估。
The aurora is a readily visible phenomenon of interest to many members of the public. However, the aurora and associated phenomena can also significantly impact communications, ground‐based infrastructure, and high‐altitude radiation exposure. Forecasting the location of the auroral oval is therefore a key component of space weather forecast operations. A version of the OVATION‐Prime 2013 auroral precipitation model (Newell et al., 2014, https://doi.org/10.1002/2014sw001056) was used by the UK Met Office Space Weather Operations Centre (MOSWOC). The operational implementation of the OVATION‐Prime 2013 model at the UK Met Office delivered a 30‐min forecast of the location of the auroral oval and the probability of observing the aurora. Using weather forecast evaluation techniques, we evaluate the ability of the OVATION‐Prime 2013 model forecasts to predict the location and probability of the aurora occurring by comparing the forecasts with auroral boundaries determined from data from the IMAGE satellite between 2000 and 2002. Our analysis shows that the operational model performs well at predicting the location of the auroral oval, with a relative operating characteristic (ROC) score of 0.82. The model performance is reduced in the dayside local time sectors (ROC score = 0.59) and during periods of higher geomagnetic activity (ROC score of 0.55 for Kp = 8). As a probabilistic forecast, OVATION‐Prime 2013 tends to underpredict the occurrence of aurora by a factor of 1.1–6, while probabilities of over 90% are overpredicted.
DOI: 10.1029/2020sw002603
发表时间: 2020-10
期刊: Space Weather
影响因子: --
作者:
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发表时间: 2017
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发表时间: 2002
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影响因子: 1.9
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