Interhemispheric Comparisons of Large Nighttime Magnetic Perturbation Events Relevant to GICs

Interhemispheric Comparisons of Large Nighttime Magnetic Perturbation Events Relevant to GICs
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与 GIC 相关的大型夜间磁扰动事件的半球间比较

DOI:
10.1029/2020ja028128
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发表时间:
2020
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
通讯作者:
Opgenoorth, Hermann
Opgenoorth, Hermann
中科院分区:
--
文献类型:
--
作者:
Engebretson, Mark J.;Kirkevold, Kathryn R.;Steinmetz, Erik S.;Pilipenko, Viacheslav A.;Moldwin, Mark B.;McCuen, Brett A.;Clauer, C. R.;Hartinger, Michael D.;Coyle, Shane;Opgenoorth, Hermann

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几乎所有的研究脉冲磁扰动事件(MPE)与大磁场变化(dB/dt),可以产生危险的地磁感应电流(GIC)使用的数据从北方半球。在这里,我们介绍了四个大振幅MPE事件的细节(|ΔBx|> 900 nT,|DB/DT|> 10 nT/s(至少一种成分),2015年至2018年在共轭高纬度地区观测到(65-80°校正地磁纬度),使用来自(1)加拿大北极区东部的Pangnirtung和伊卡卢伊特以及南极洲磁共轭南极站的磁强计数据,以及(2)格陵兰西海岸链和南极洲的两个磁共轭链的磁强计数据,AAL-PIP和BAS LPM。从一个到三个不同的孤立的MPE定位在校正地磁纬度观察到在三个午夜前的事件,许多同时在两个半球3分钟内。然而,它们的共轭纬向振幅分布最多在质量上相匹配。在一个延长的postmidnight的时间间隔,我们与一个间隔的欧米茄波段,多个高度本地化的MPE发生独立的时间在每个站在两个半球。这些夜间MPEs发生在各种地磁条件下,但每个都有一个共同的负行星际磁场Bz,在事件发生时或接近事件发生时至少有适度的增加。扰动幅度的比较,在共轭半球的电离层电导模型显然有利于电流发电机模型的电压发电机模型的四个事件中的三个,没有一个模型提供了一个很好的适合发生在春分附近的午夜前的事件。
Nearly all studies of impulsive magnetic perturbation events (MPEs) with large magnetic field variability (dB/dt) that can produce dangerous geomagnetically induced currents (GICs) have used data from the Northern Hemisphere. Here we present details of four large‐amplitude MPE events (|ΔBx| > 900 nT and |dB/dt| > 10 nT/s in at least one component) observed between 2015 and 2018 in conjugate high‐latitude regions (65–80° corrected geomagnetic latitude), using magnetometer data from (1) Pangnirtung and Iqaluit in eastern Arctic Canada and the magnetically conjugate South Pole Station in Antarctica and (2) the Greenland West Coast Chain and two magnetically conjugate chains in Antarctica, AAL‐PIP and BAS LPM. From one to three different isolated MPEs localized in corrected geomagnetic latitude were observed during three premidnight events; many were simultaneous within 3 min in both hemispheres. Their conjugate latitudinal amplitude profiles, however, matched qualitatively at best. During an extended postmidnight interval, which we associate with an interval of omega bands, multiple highly localized MPEs occurred independently in time at each station in both hemispheres. These nighttime MPEs occurred under a wide range of geomagnetic conditions, but common to each was a negative interplanetary magnetic fieldBzthat exhibited at least a modest increase at or near the time of the event. A comparison of perturbation amplitudes to modeled ionospheric conductances in conjugate hemispheres clearly favored a current generator model over a voltage generator model for three of the four events; neither model provided a good fit for the premidnight event that occurred near vernal equinox.
DOI: 10.1029/2019ja026794
发表时间: 2019-09
期刊: Journal of Geophysical Research: Space Physics
影响因子: --
作者:
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极光欧米伽带是大地磁感应电流的重要原因
DOI: --
发表时间: 2020
影响因子: 5.2
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DOI: 10.5194/angeo-24-725-2006
发表时间: 2006
影响因子: 1.9
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