...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Space Weather >Quantifying extreme behavior in geomagnetic activity
【24h】

Quantifying extreme behavior in geomagnetic activity

机译：量化地磁活动中的极端行为

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Understanding the extremes in geomagnetic activity is an important component in understanding just how severe conditions can become in the terrestrial space environment. Extreme activity also has consequences for technological systems. On the ground, extreme geomagnetic behavior has an impact on navigation and position accuracy and the operation of power grids and pipeline networks. We therefore use a number of decades of one-minute mean magnetic data from magnetic observatories in Europe, together with the technique of extreme value statistics, to provide a preliminary exploration of the extremes in magnetic field variations and their one-minute rates of change. These extremes are expressed in terms of the variations that might be observed every 100 and 200 years in the horizontal strength and in the declination of the field. We find that both measured and extrapolated extreme values generally increase with geomagnetic latitude (as might be expected), though there is a marked maximum in estimated extreme levels between about 53 and 62 degrees north. At typical midlatitude European observatories (55–60 degrees geomagnetic latitude), compass variations may reach approximately 3–8 degrees/minute, and horizontal field changes may reach 1000–4000 nT/minute, in one magnetic storm once every 100 years. For storm return periods of 200 years the equivalent figures are 4–11 degrees/minute and 1000–6000 nT/minute.
机译：了解地磁活动的极端情况对于了解地球空间环境中的恶劣条件会变得多么重要。极端活动也对技术系统产生影响。在地面上，极端的地磁行为会影响导航和位置的准确性以及电网和管道网络的运行。因此，我们使用了来自欧洲磁性观测站的数十年的一分钟平均磁数据，以及极值统计技术，来初步探究磁场变化的极值及其一分钟的变化率。这些极端值是根据每100年和200年在水平强度和磁偏角上可能观察到的变化表示的。我们发现，测得的和推算出的极端值通常都随地磁纬度的增加而增加（这可能是预期的），尽管估计的极端水平在北纬53至62度之间有明显的最大值。在典型的中纬度欧洲天文台（地磁纬度55-60度）中，指南针变化可能达到约3-8度/分钟，水平场变化可能达到1000-4000 nT /分钟，每100年一次磁暴。对于200年的风暴返回期，等效数字为4-11度/分钟和1000-6000 nT /分钟。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号