在2023年4月23-24日的地磁风暴期间,地电场和地磁诱导的电流
Anna Wawrzaszek1, Rajkumar Hajra2, Agnieszka Gil3,4
1Space Research Centre, Polish Academy of Sciences (CBK PAN), Warsaw, Poland. anna.wawrzaszek@cbk.waw.pl.
Scientific reports
|October 24, 2024
概括
强烈的地磁风暴会导致动态的地电场. 我们的研究绘制了这些变化,并计算了地磁诱导电流 (GIC),显示了与观测值的强相关性,有助于GIC预测.
科学领域:
- 空间物理 空间物理
- 地质物理学 地质物理学
- 太阳地球物理 太阳地球物理
背景情况:
- 强烈的地磁风暴是由冠状体质量喷射等太阳事件驱动的,对地球的地电场产生重大影响.
- 了解地电场动态对于评估与地磁诱导电流 (GIC) 相关的风险至关重要.
研究的目的:
- 为了分析2023年4月23-24日期间地电场 (E) 的空间和时间变化,强烈的地磁风暴.
- 使用建模的地电场计算和验证地磁诱导电流 (GIC).
- 评估地质电场测绘在未被监测的地点用于GIC估计的实用性.
主要方法:
- 应用地电动地图 (GEDMap) 代码,利用来自北欧29个观测站的磁力计数据.
- 在暴风雨主要阶段的夜间和早晨强烈的亚风暴期间的空间E场映射.
- 基于计算的E场,在Mäntsälä亚极光站计算GIC.
主要成果:
- 在亚风暴事件期间,GEDMap揭示了地质电场的显著加剧和强大的变化.
- 在早晨的事件中观察到地电场方向的显著变化.
- 模拟的GIC值与观察到的GIC数据显示出显著的相关性.
结论:
- 地电场测绘有效地捕捉了强烈地磁风暴和亚风暴期间的动态变化.
- 该方法为在缺乏磁力计覆盖范围的地区确定GIC提供了基础.
- 这种方法提高了对GIC变异性和太空天气事件期间潜在影响的理解.
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