Simultaneous tracking of reconnected flux tubes: Cluster and conjugate SuperDARN observations on 1 April 2004
Simultaneous tracking of reconnected flux tubes: Cluster and conjugate SuperDARN observations on 1 April 2004
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同时跟踪重新连接的通量管：2004 年 4 月 1 日的聚类和共轭 SuperDARN 观测
DOI：
10.5194/angeo-26-1545-2008
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发表时间：
2008-06
影响因子：
1.9
通讯作者：
Shi, Q. Q.
中科院分区：
文献类型：
--
作者：
Hu, Z. J.;Liu, R. Y.;Hu, H. Q.;Dunlop, M. W.;Taylor, M. G. G. T.;Lester, M.;Zhang, Q. -H.;Huang, J. Y.;Liu, Y. H.;Shi, Q. Q.
当星团航天器位于高纬度磁层顶附近时，2004年4月1日11：30-13：00 UT期间，观测到了一系列中到大尺度（40 nT，0.6- 1.2 Re）的FTE。在这一过程中，同步和共轭的SuperDARN测量是可用的，显示了一个全球流动模式，这是符合预期的（映射）西北运动（主要是亚太阳）重新连接，磁通量在磁层顶。我们重点分析了三个FTE的局部响应，通过四个航天器的测量以及它们相应的地面映射运动来跟踪它们的磁层顶运动。对于其中两个FTE，跟踪与北方半球隐式通量管的每个足迹处的电离层流强烈协调，条件对应于稳定的、增加的（>100）时钟角，而第三个事件，对应性不太强，与低（<100）时钟角重合。根据推断的X线测量和模拟的通量管运动，在定性上与SuperDARN模拟测量的北方半球每个位置的向北和向西流动的电离层对流中的明显速度增强相匹配，并且也与这些事件发生时南半球观测到的东南电离层流动大致匹配。这些速度增强的时间周期推断FTE从磁层顶起源到加入极帽的演化时间约为4-6 min。然而，对于12：31 UT FTE，南半球的电离层响应时间可能比北方半球的响应时间长2分钟（对于12：51 UT FTE，长6分钟）。
While the Cluster spacecraft were located near the high-latitude magnetopause, between 11:30-13:00 UT on 1 April 2004, a series of medium to large scale (40 nT, 0.6- 1.2 Re) FTEs were observed. During this pass, simultaneous and conjugated SuperDARN measurements are available that show a global flow pattern which is consistent with the ex- pected (mapped) north-west motion of (predominantly sub- solar) reconnected, magnetic flux at the magnetopause. We focus on analysing the local response of three FTEs, tracking their magnetopause motion via the four-spacecraft measure- ments together with their corresponding ground mapped mo- tions. For two of these FTEs, where the tracking is strongly coordinated with the ionospheric flow at each footprint of the implied flux tubes in the Northern Hemisphere, condi- tions corresponded to stable, increasing (>100 ) clock an- gle, while the third event, where the correspondence is less strong, coincided with low (<100 ) clock angle. Flux tube motion, both measured and modeled from the inferred X- line, qualitatively matches the clear velocity enhancements in ionospheric convections with northward and westward flow at each location in the Northern Hemisphere, measured si- multaneously by SuperDARN, and also roughly matches the observed, south-eastward ionospheric flow in the Southern Hemisphere at the time of these events. The time periods of these velocity enhancements infer that the evolution time of the FTEs is about 4-6 min from its origin on magne- topause to its addition to the polar cap. However, the iono- spheric response time in the Southern Hemisphere might be 2 min longer for the 12:31 UT FTE (and 6 min longer for the 12:51 UT FTE) than the response time in the Northern Hemi- sphere.
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影响因子：
1.9
作者：
J. Wild;S. Milan;S. Cowley;M. Dunlop;C. Owen;J. Bosqued;M. Taylor;J. Davies;M. Lester;N. Sato;A. Yukimatu;A. Fazakerley;A. Balogh;H. Rème
通讯作者：
J. Wild;S. Milan;S. Cowley;M. Dunlop;C. Owen;J. Bosqued;M. Taylor;J. Davies;M. Lester;N. Sato;A. Yukimatu;A. Fazakerley;A. Balogh;H. Rème
影响因子：
10.3
作者：
A. Balogh;M. Dunlop;S. Cowley;D. Southwood;J. Thomlinson;K. Glassmeier;G. Musmann;H. Lühr
通讯作者：
A. Balogh;M. Dunlop;S. Cowley;D. Southwood;J. Thomlinson;K. Glassmeier;G. Musmann;H. Lühr
影响因子：
--
作者：
C. Russell;M. Mellott;E. Smith;J. King
通讯作者：
C. Russell;M. Mellott;E. Smith;J. King
影响因子：
1.9
作者：
D. Neudegg;T. Yeoman;S. Cowley;G. Provan;G. Haerendel;Wolfgang Baumjohann;U. Auster;K. Fornacon;E. Georgescu;C. Owen
通讯作者：
D. Neudegg;T. Yeoman;S. Cowley;G. Provan;G. Haerendel;Wolfgang Baumjohann;U. Auster;K. Fornacon;E. Georgescu;C. Owen
DOI：
10.1029/gl017i012p02241
发表时间：
1990-11
期刊：
--
影响因子：
--
作者：
R. Elphic;M. Lockwood;S. Cowley;P. Sandholt
通讯作者：
R. Elphic;M. Lockwood;S. Cowley;P. Sandholt