【摘 要】
：
Based on Cluster observations,the propagation velocities and normal directions of hot flow anomaly(HFA) boundaries upstream the Earths bow shock are calculated.Twenty-one young HFAs,which have clear l
【机 构】
：
Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment,Institute
【出 处】
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The Fourteenth International Solar Wind Conference (第十四届国际太阳
论文部分内容阅读
Based on Cluster observations,the propagation velocities and normal directions of hot flow anomaly(HFA) boundaries upstream the Earths bow shock are calculated.Twenty-one young HFAs,which have clear leading and trailing boundaries,were selected and multi-spacecraft timing method considering errors was employed for the investigation.Based on the difference in the propagation velocity of the leading and trailing edges,we categorized these events into three groups,namely,contracting,expanding and stable events.Compared with the total pressure(sum of the magnetic pressure and thermal pressure) outside of the leading edges,the pressure inside the structure is higher for expanding events,and lower for contracting events,and has no significant difference for the stable ones,indicating that the pressure plays an important role in the evolution of young HFAs.
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