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Magnetospheric vortices and their global effect after a solar wind dynamic pressure decrease

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Název: Magnetospheric vortices and their global effect after a solar wind dynamic pressure decrease
Autoři: Zhao, HY, Shen, XC, Tang, BB, Tian, AM, Shi, QQ, Weygand, JM, Yao, ZH, Zong, QG, Fu, SY, Yao, ST, Xiao, T, Pu, ZY, Shi, QQ (reprint author), Shandong Univ, Sch Space Sci & Phys, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai, Peoples R China.
Rok vydání: 2016
Sbírka: National Space Science Center: NSSC OpenIR (Chinese Academy of Sciences) / 中国科学院国家空间科学中心机构知识库
Témata: Negative Solar Wind Dynamic Pressure Pulse, Magnetosphere Vortex, Field-aligned Current
Popis: Using multipoint data from three Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites, we report a magnetospheric flow vortex driven by a negative solar wind dynamic pressure pulse. The observed vortex rotated in a direction opposite to that associated with positive solar wind dynamic pressure pulses. The vortex was moving tailward, as confirmed by a global magnetohydrodynamics (MHD) simulation. In addition, the equivalent ionospheric currents (EICs) deduced from ground magnetometer station data reveal that a current vortex in the ionosphere near the foot point of the satellites has a rotation sense consistent with that observed in the magnetosphere. The field-aligned current (FAC) density estimated from three THEMIS satellites is about 0.15nA/m(2), and the total FAC of the vortex is about 1.5-3x10(5)A, on the order of the total FAC in a pseudobreakup, but less than the total FAC in most moderate substorms, 10(6)A. Key Points
Druh dokumentu: report
Jazyk: English
Relation: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; http://ir.nssc.ac.cn/handle/122/5401
Dostupnost: http://ir.nssc.ac.cn/handle/122/5401
Rights: cn.org.cspace.api.content.CopyrightPolicy@a441e6
Přístupové číslo: edsbas.9DDBDBEB
Databáze: BASE
Popis
Abstrakt:Using multipoint data from three Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites, we report a magnetospheric flow vortex driven by a negative solar wind dynamic pressure pulse. The observed vortex rotated in a direction opposite to that associated with positive solar wind dynamic pressure pulses. The vortex was moving tailward, as confirmed by a global magnetohydrodynamics (MHD) simulation. In addition, the equivalent ionospheric currents (EICs) deduced from ground magnetometer station data reveal that a current vortex in the ionosphere near the foot point of the satellites has a rotation sense consistent with that observed in the magnetosphere. The field-aligned current (FAC) density estimated from three THEMIS satellites is about 0.15nA/m(2), and the total FAC of the vortex is about 1.5-3x10(5)A, on the order of the total FAC in a pseudobreakup, but less than the total FAC in most moderate substorms, 10(6)A. Key Points