Identifying the magnetotail source region leading to preonset poleward boundary intensifications

Nishimura Y.; Lyons L.R.; Xing X.Angelopoulos V.Donovan E.F.Mende S.B.Bonnell J.W.Auster U.

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Identifying the magnetotail source region leading to preonset poleward boundary intensifications

机译：识别磁尾地区主要来源preonset向边界强化

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Substorm auroral onset is often preceded by plasma sheet flow bursts, poleward boundary intensifications (PBIs), and subsequent auroral streamers, suggesting that enhanced transient flows in the plasma sheet propagating toward the near-Earth plasma sheet play an important role in leading to substorm onset. This study aims at determining the magnetotail source region of preonset PBIs and plasma sheet flows by using the ARTEMIS spacecraft coordinated with the THEMIS all-sky imager array. ARTEMIS has an advantage of measuring flows between the nominal near-Earth neutral line (NENL) and distant neutral line (DNL) locations, and thus, the flow direction allows identifying which source region is dominant. We found three preonset conjunction events, and all cases show earthward flow bursts ～10-30 min before substorm onset when PBIs and streamers are detected in the conjugate ionosphere. This time lag is sufficiently long to bring plasma from the ARTEMIS location toward the near-Earth plasma sheet before onset. The earthward flow direction indicates that preonset enhanced flow channels leading to precursor PBIs originate from further downtail of ARTEMIS, possibly from DNL rather than from NENL. The flow direction changes to tailward after the substorm onset, suggesting that NENL is not related to preonset flow and auroral activity but becomes active during the expansion phase.

机译：亚暴极光发生之前往往是等离子体片流破裂,向南极的边界强化(PBIs)和随后的极光飘带,表明增强瞬态在等离子体流表传播向近地等离子体中扮演重要角色导致亚暴发病。确定磁尾来源地区preonset PBIs和等离子板流动使用阿耳特弥斯飞船与法律协调次全天成像仪数组。测量名义近地之间的流动中性线(NENL)和遥远的中性线(黑暗)的位置,因此,流动方向允许识别哪些来源地区占主导地位。事件,所有病例显示向地面流爆发~ 10 - 30分钟前亚暴PBIs和时发病检测到飘带共轭电离层。把等离子体从阿耳特弥斯向位置近地发作前等离子体片。表明preonset向地面的流动方向增强导致前驱PBIs流动通道源自进一步downtail阿耳忒弥斯,可能从黑暗而不是NENL。方向改变后tailward亚暴开始,这表明NENL并不相关preonset流和极光活动而成活跃在扩张阶段。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2013年第7期|4335-4340|共6页
作者
Nishimura Y.; Lyons L.R.; Xing X.Angelopoulos V.Donovan E.F.Mende S.B.Bonnell J.W.Auster U.;
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作者单位

Space Science Laboratory, University of California, Berkeley, CA, United States;

Department of Atmospheric and Oceanic Sciences, University of California, 405 Hilgard Ave., Los Angeles, CA 90095-1565, United States;

Institut für Geophysik und Extraterrestrische Physik, Technischen Universit?t Braunschweig, Braunschweig, GermanyDepartment of Earth and Space Sciences, University of California, Los Angeles, CA, United StatesDepartment of Physics and Astronomy, University of Calgary, Calgary, AB, Canada;

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正文语种英语
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Coverlets; Current direction; aurorasIntensificationBlood plasmaPlasmasNeutral conductorsDCLRE1C geneSTREAMERSFlowPLASMA SHEETStreamers;

机译：当前床单;方向;aurorasIntensificationBloodplasmaPlasmasNeutral conductorsDCLRE1C;

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Identifying the magnetotail source region leading to preonset poleward boundary intensifications

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