SECS Analysis of Nighttime Magnetic Perturbation Events Observed in Arctic Canada
SECS Analysis of Nighttime Magnetic Perturbation Events Observed in Arctic Canada
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加拿大北极地区观测到的夜间磁扰动事件的 SECS 分析
DOI：
10.1029/2021ja029839
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Ohtani, Shin‐Ichi
中科院分区：
文献类型：
--
作者：
Weygand, James M.;Engebretson, Mark J.;Pilipenko, Viacheslav A.;Steinmetz, Erik S.;Moldwin, Mark B.;Connors, Martin G.;Nishimura, Yukitoshi;Lyons, Larry R.;Russell, Christopher T.;Ohtani, Shin‐Ichi
在午夜后的几个小时内，经常观察到与磁扰动事件(MPE)有关的磁场的大变化，其幅度|ΔB|为数百nT，持续时间为5-10分钟。这项研究比较了2015年和2017年在加拿大东部的多塞特角和库胡拉皮克两个站观测到的极光洋流系统中夜间MPE的统计位置与|db/dt|≥6 nT/S。利用球面基本电流系(SECS)技术绘制了二维夜侧极光流系图。在每个站点对所有事件以及午夜前和午夜后的子集进行了分析。我们详细研究了四个MPE间隔，其中两个伴随着极光图像，并显示了MPE与包括电喷流和类场向电流在内的头顶电离层电流系统之间的不同联系。我们发现279个MPE中有225个发生在西向电喷流内，只有3个发生在东向电喷流内。对于午夜前的MPE，230个事件中的100个事件发生在Harang电流系统内，而其余的许多事件发生在向下区域1电流系统或向上区域2电流系统内。在49个午夜后的MPE中，许多发生在向下的区域1(11个事件)或向上的区域2当前系统(27个事件)。这些结果表明，午夜前区域的MPE源位于内至中区等离子体片之间，而午夜后区的MPE源位于内磁层与内等离子体片之间。
Large changes of the magnetic field associated with magnetic perturbation events (MPEs) with amplitudes |ΔB| of hundreds of nT and 5–10 min duration have been frequently observed within a few hours of midnight. This study compares the statistical location of nighttime MPEs with |dB/dt| ≥ 6 nT/s within the auroral current system observed during 2015 and 2017 at two stations, Cape Dorset and Kuujjuarapik, in Eastern Canada. Maps of the two dimensional nightside auroral current system were derived using the Spherical Elementary Current Systems (SECS) technique. Analyses were produced at each station for all events, and for premidnight and postmidnight subsets. We examine four MPE intervals in detail, two accompanied by auroral images, and show the varying associations between MPEs and overhead ionospheric current systems including electrojets and the field‐aligned like currents. We find 225 of 279 MPEs occurred within the westward electrojet and only 3 within the eastward electrojet. For the premidnight MPEs 100 of 230 events occurred within the Harang current system while many of the remainder occurred within either the downward region 1 current system or the upward region 2 current system. Many of the 49 postmidnight MPEs occurred in either the downward region 1 (11 events) or upward region 2 current system (27 events). These result suggest that the source of MPEs in the premidnight sector is somewhere between the inner to mid plasma sheet and the source for the MPEs in the postmidnight sector is somewhere between the inner magnetosphere and the inner plasma sheet.
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加拿大北极地区观测到的夜间磁扰动事件的叠加历元分析
DOI：
10.1029/2021ja029465
发表时间：
2021
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
--
作者：
Engebretson, Mark J.;Ahmed, Lidiya Y.;Pilipenko, Viacheslav A.;Steinmetz, Erik S.;Moldwin, Mark B.;Connors, Martin G.;Boteler, David H.;Weygand, James M.;Coyle, Shane;Ohtani, Shin
通讯作者：
Ohtani, Shin
DOI：
10.1029/2019ja026794
发表时间：
2019-09
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
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作者：
Mark J. Engebretson;V. Pilipenko;L. Ahmed;J. Posch;E. Steinmetz;M. Moldwin;Martin G. Connors
通讯作者：
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DOI：
10.1002/2015ja021343
发表时间：
2015-12
期刊：
Journal of Geophysical Research: Space Physics
影响因子：
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作者：
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C. Forsyth;I. J. Rae;J. Coxon;M. Freeman;C. Jackman;Jesper Gjerloev;Jesper Gjerloev;A. Fazakerley
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影响因子：
5.2
作者：
S. Apatenkov;V. Pilipenko;E. Gordeev;A. Viljanen;L. Juusola;V. Belakhovsky;Y. Sakharov;V. Selivanov
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影响因子：
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作者：
Dimmock A
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Dimmock A