题目：Substorm Current Wedge Formation: case study and statistic

主讲：尧中华博士

时间：2013年01月21日（周一）下午3：00

地点：科学实验楼学术报告厅

摘要：

In the late growth phase when an earthward flow is braking and azimuthally diverting, the pressure gradients in the X- and Y-direction are both enhanced at the front edge of the flow. The enhanced pressure gradient in Y-direction is dawnward (duskward) on the dawnside (duskside) where a clockwise (counter-clockwise) vortex is forming. This dawn-dusk pressure gradient drives downward (upward) field-aligned current (FAC) on the dawnside (duskside) of the flow, which, combined with the FACs generated by the clockwise (counter-clockwise) vortex, forms the SCW. Substorm aurora onset occurs when the vortices appear, while near-Earth dipolarization onset is observed by the probes when a rapid jump of the Y-component of pressure gradient is detected. The total FACs from vortex and pressure gradient are found to be comparable to the DP-1 current in a typical substorm. Both case study and statistical study present strong evidences.

简介：

研究经历

2008-2010：聚变物理（硕士）

2010-2011：亚暴期间磁尾熵的演化过程

2011-2012：亚暴电流楔的形成机制

文章列表

1. Yao, Z.H., et al., Mechanism of substorm current wedge formation: THEMIS observations. Geophysical Research Letters, 2012. 39(13): p. L13102.

2. Yao, Z.H., et al., Flow Diversion in the Near-Earth Region and Auroral Arc Extension. J. Geophys. Res, 2012. Under revision (second round review).

3. Yao, Z.H., et al., Pressure gradient evolution during substorm BBFs: statistics. J. Geophys. Res, to be submitted

4. Yao, Z.H., et al., The changes and evolution of Entropy in Near-earth plasma sheet before and after substorm. To be submitted to Ann. Geophys

5. Quanqi Shi, Michael Hartinger, Vassilis Angelopoulos, Qiu-Gang Zong, Xu-Zhi Zhou, Xiaoyan Zhou, Adam C Kellerman, An min Tian, James M. Weygand, Suiyan Fu, Zuyin Pu, Joachim Raeder, Ya Song Ge, Yongfu Wang, Hui Zhang, Zhonghua Yao. (2012), THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events, J. Geophys. Res., doi:10.1029/2012JA017984, in press.

6. Z. Y. Pu, X. N. Chu, X. Cao, V. Mishin, V. Angelopoulos, J. Wang, Y. Wei, Q. G. Zong, S. Y. Fu, L. Xie, K.‐H. Glassmeier, H. Frey, C. T. Russell, J. Liu, J. McFadden, D. Larson, S. Mende, I. Mann, D. Sibeck, L. A. Sapronova, M. V. Tolochko, T. I. Saifudinova, Z. H. Yao, et al., THEMIS observations of substorms on 26 February 2008 initiated by magnetotail reconnection. J. Geophys. Res, 2010. 115: p. A02212.