Abstract. Over the hours of 5–9 UT on June 8 2001, the extreme ultraviolet (EUV) instrument onboard IMAGE satellite observed a Shoulder-like formation in the morning sector and a Plume-like structure straddling in the between noon and dusk region. Simulation results of the plasmapause formation based on mechanism of drift motion called Test Particle Model (TPM) and have reproduced various plasmapause structures and subsequent evolution of the Shoulder. The analysis indicated that the Shoulder is created by a dawn-dusk convection electric field intensity, sharp reduction and spatial nonuniform manifested. As, combination of the plasmaspheric rotation rate speed up with L-shell increase and plasma flux do radial outflow in the predawn sector to interact, and produce an asymmetric bulge that rotates eastward. The Shoulder-like structure rotates sunward and develops to the single or double Plume structure during active times.

中文翻译：

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等离子肩结构形成的新视角与解释

摘要。在2001年6月8日UT的5–9 UT期间，IMAGE卫星上的极紫外（EUV）仪器在早晨扇形观测到了肩状结构，并在中午和黄昏之间跨出了呈羽毛状的结构。基于称为测试粒子模型（TPM）的漂移运动机理的等离子暂停形成的模拟结果，并再现了各种等离子暂停结构和肩部的后续演变。分析表明，肩峰是由黎明-黄昏对流电场强度，急剧减小和空间不均匀所形成的。因此，等离子层旋转速度的增加与L壳层的增加以及等离子流在黎明前扇形区中的径向流出相互作用而发生相互作用，并产生向东旋转的不对称凸起。