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Coordinated Cluster/Double Star and ground-based observations of dayside reconnection

【标题】Coordinated Cluster/Double Star and ground-based observations of dayside reconnection

【Title】Coordinated Cluster/Double Star and ground-based observations of dayside reconnection2004

【DOI】10.5194/angeo-29-1827-2011

【作者】 张清和; 刘瑞源; 胡红桥; 张北辰; 胡泽骏

【Author】 Zhang Qinghe ; Liu Ruiyuan ; Hu Hongqiao ; Zhang Beichen ; Hu Zejun

【期刊】Annales Geophysicae

【Journal】Annales Geophysicae

【期刊年份】2011

【卷】29

【期】10

【关键词】 磁层物理; 空间等离子体物理

【Keywords】 Magnetospheric physics (Magnetopause, cusp,and boundary layers; Magnetosphere-ionosphere interactions)

【摘要】A number of flux transfer events (FTEs) were observed between 09:00 and 12:00UT on 11 February 2004,during southward and dawnward IMF, while the Cluster spacecraft array moved outbound through the northern, highaltitude cusp and dayside high-latitude boundary layer, and the Double Star TC-1 spacecraft was crossing the dayside low-latitude magnetopause into the magnetosheath south of the ecliptic plane. The Cluster array grazed the equatorial cusp boundary, observing reconnection-like mixing of magnetosheath and magnetospheric plasma populations. In an adjacent interval, TC-1 sampled a series of sometimes none standard FTEs, but also with mixed magnetosheath and magnetospheric plasma populations, near the magnetopause crossing and later showed additional (possibly turbulent) activity not characteristic of FTEs when it was situated deeper in the magnetosheath. The motion of these FTEs are analyzed in some detail to compare to simultaneous, poleward-moving plasma concentration enhancements recorded by EISCAT Svalbard Radar (ESR) and “polewardmoving radar auroral forms” (PMRAFs) on the CUTLASS Finland and Kerguelen Super Dual Auroral Radar Network (SuperDARN) radar measurements. Conjugate SuperDARN observations show a predominantly two-cell convection pattern in the Northern and Southern Hemispheres. The results are consistent with the expected motion of reconnected magnetic flux tubes, arising from a predominantly sub-solar reconnection site. Here, we are able to track north and south in closely adjacent intervals as well as to map to the corresponding ionospheric footprints of the implied flux tubes and demonstrate these are temporally correlated with clear iono-Correspondence to: Q.-H. Zhang(zhangqinghe@pric.gov.cn) spheric velocity enhancements, having northward (southward) and eastward (westward) convected flow components in the Northern (Southern) Hemisphere. The durations of these enhancements might imply that the evolution time of the FTEs is about 18–22 min from their origin on magnetopause (at reconnection site) to their addition to the magnetotail lobe. However, the ionospheric response time in the Northern Hemisphere is about 2–4 min longer than the response time in the Southern Hemisphere.

【Abstract】A number of flux transfer events (FTEs) were observed between 09:00 and 12:00UT on 11 February 2004,during southward and dawnward IMF, while the Cluster spacecraft array moved outbound through the northern, highaltitude cusp and dayside high-latitude boundary layer, and the Double Star TC-1 spacecraft was crossing the dayside low-latitude magnetopause into the magnetosheath south of the ecliptic plane. The Cluster array grazed the equatorial cusp boundary, observing reconnection-like mixing of magnetosheath and magnetospheric plasma populations. In an adjacent interval, TC-1 sampled a series of sometimes none standard FTEs, but also with mixed magnetosheath and magnetospheric plasma populations, near the magnetopause crossing and later showed additional (possibly turbulent) activity not characteristic of FTEs when it was situated deeper in the magnetosheath. The motion of these FTEs are analyzed in some detail to compare to simultaneous, poleward-moving plasma concentration enhancements recorded by EISCAT Svalbard Radar (ESR) and “polewardmoving radar auroral forms” (PMRAFs) on the CUTLASS Finland and Kerguelen Super Dual Auroral Radar Network (SuperDARN) radar measurements. Conjugate SuperDARN observations show a predominantly two-cell convection pattern in the Northern and Southern Hemispheres. The results are consistent with the expected motion of reconnected magnetic flux tubes, arising from a predominantly sub-solar reconnection site. Here, we are able to track north and south in closely adjacent intervals as well as to map to the corresponding ionospheric footprints of the implied flux tubes and demonstrate these are temporally correlated with clear iono-Correspondence to: Q.-H. Zhang(zhangqinghe@pric.gov.cn) spheric velocity enhancements, having northward (southward) and eastward (westward) convected flow components in the Northern (Southern) Hemisphere. The durations of these enhancements might imply that the evolution time of the FTEs is about 18–22 min from their origin on magnetopause (at reconnection site) to their addition to the magnetotail lobe. However, the ionospheric response time in the Northern Hemisphere is about 2–4 min longer than the response time in the Southern Hemisphere.

【基金/项目】 极区海洋大气与空间环境业务化监测及其在气候变化预测中的应用(地球极区太阳风能量注入过程与模式) ; 极区电离层对日侧磁重联的响应研究 ; 日侧冕状极光的分类及其产生机制研究 ; 极区能量沉积过程及其对120E子午面电离层影响的研究 ; 小尺度极光结构的多尺度并行观测与研究 ; 极区电离层对日侧磁重联响应的卫星和地面联合观测研究

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