Exploring Localized Geomagnetic Disturbances in Global MHD: Physics and Numerics

IF 3.7 2区 地球科学
Space Weather Pub Date : 2024-04-08 DOI:10.1029/2023sw003799
Erik M. Vandegriff, Daniel T. Welling, Agnit Mukhopadhyay, Andrew P. Dimmock, Steven K. Morley, Ramon E. Lopez
{"title":"Exploring Localized Geomagnetic Disturbances in Global MHD: Physics and Numerics","authors":"Erik M. Vandegriff, Daniel T. Welling, Agnit Mukhopadhyay, Andrew P. Dimmock, Steven K. Morley, Ramon E. Lopez","doi":"10.1029/2023sw003799","DOIUrl":null,"url":null,"abstract":"One of the prominent effects of space weather is the formation of rapid geomagnetic field variations on Earth's surface driven by the magnetosphere-ionosphere system. These geomagnetic disturbances (GMDs) cause geomagnetically induced currents to run through ground conducting systems. In particular, localized GMDs (LGMDs) can be high amplitude and can have an effect on scale sizes less than 100 km, making them hazardous to power grids and difficult to predict. In this study, we examine the ability of the Space Weather Modeling Framework (SWMF) to reproduce LGMDs in the 7 September 2017 event using both existing and new metrics to quantify the success of the model against observation. We show that the high-resolution SWMF can reproduce LGMDs driven by ionospheric sources, but struggles to reproduce LGMDs driven by substorm effects. We calculate the global maxima of the magnetic fluctuations to show instances when the SWMF captures LGMDs at the correct times but not the correct locations. To remedy these shortcomings we suggest model developments that will directly impact the ability of the SWMF to reproduce LGMDs, most importantly updating the ionospheric conductance calculation from empirical to physics-based.","PeriodicalId":22181,"journal":{"name":"Space Weather","volume":"100 1","pages":""},"PeriodicalIF":3.7000,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Space Weather","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1029/2023sw003799","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0

Abstract

One of the prominent effects of space weather is the formation of rapid geomagnetic field variations on Earth's surface driven by the magnetosphere-ionosphere system. These geomagnetic disturbances (GMDs) cause geomagnetically induced currents to run through ground conducting systems. In particular, localized GMDs (LGMDs) can be high amplitude and can have an effect on scale sizes less than 100 km, making them hazardous to power grids and difficult to predict. In this study, we examine the ability of the Space Weather Modeling Framework (SWMF) to reproduce LGMDs in the 7 September 2017 event using both existing and new metrics to quantify the success of the model against observation. We show that the high-resolution SWMF can reproduce LGMDs driven by ionospheric sources, but struggles to reproduce LGMDs driven by substorm effects. We calculate the global maxima of the magnetic fluctuations to show instances when the SWMF captures LGMDs at the correct times but not the correct locations. To remedy these shortcomings we suggest model developments that will directly impact the ability of the SWMF to reproduce LGMDs, most importantly updating the ionospheric conductance calculation from empirical to physics-based.
探索全球 MHD 中的局部地磁扰动:物理学与数值学
空间天气的突出影响之一是在磁层-电离层系统的驱动下在地球表面形成快速的地磁场变化。这些地磁扰动(GMDs)导致地磁感应电流穿过地面传导系统。特别是,局部地磁扰动(LGMDs)的振幅可能很高,对小于 100 公里的尺度也会产生影响,因此对电网造成危害,而且难以预测。在本研究中,我们利用现有指标和新指标,考察了空间天气建模框架(SWMF)在 2017 年 9 月 7 日事件中再现 LGMD 的能力,以量化模型与观测的成功率。我们表明,高分辨率 SWMF 能够再现电离层源驱动的 LGMD,但难以再现亚暴效应驱动的 LGMD。我们计算了磁波动的全局最大值,以显示 SWMF 在正确的时间捕捉到 LGMD 的情况,但没有捕捉到正确的位置。为了弥补这些缺陷,我们建议对模型进行开发,这将直接影响到 SWMF 重现 LGMD 的能力,其中最重要的是更新电离层电导计算,从经验计算改为物理计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
自引率
29.70%
发文量
166
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信