Different response of dayside auroras to increases in solar wind dynamic pressure
Different response of dayside auroras to increases in solar wind dynamic pressure
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DOI：
10.1029/2010ja016385
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发表时间：
2011-08
影响因子：
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通讯作者：
Y. F. Yang;Jianyong Lu;Jing Song Wang;Zhong Peng;Q. Qian;Y. Xiao
中科院分区：
文献类型：
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作者：
Y. F. Yang;Jianyong Lu;Jing Song Wang;Zhong Peng;Q. Qian;Y. Xiao
太阳风动压的变化可以造成极光亮度的变化，特别是在昼面区域。本文主要利用极地紫外成像仪（Polar Ultraviolet Imager）的极光图像和NASA OMNI的磁场和等离子体数据，研究了行星际参数与昼侧极光增强的关系。我们首先确定了1997年至1999年太阳风动压增加引起的昼侧极光事件，并将这些事件分为两种类型：一种是随着太阳风动压的增加而增强的，另一种是随着太阳风动压的增加而没有显著增强的。然后，我们逐一研究了太阳风密度和速度对极光亮度的单独作用。我们的结果表明，日侧极光增强需要密度和太阳风速度增加的贡献。太阳风密度的增加（没有速度的增加）不能单独创建阳面极光增强。
Variations in the solar wind dynamic pressure can create changes in the auroral brightness, especially in the dayside region. In this study, mainly using Polar Ultraviolet Imager auroral images and NASA OMNI magnetic field and plasma data, we investigate the relationship between interplanetary parameters and dayside aurora intensification. We first identify the dayside aurora cases caused by the solar wind dynamic pressure increases from 1997 through 1999 and divide these cases into two types: one with intensification and the other without significant intensification following the increase in the solar wind dynamic pressure. Then, case by case, we examine the separate roles of the solar wind density and velocity on auroral brightness. Our result demonstrates that the dayside aurora intensification requires the contributions of both the density and solar wind velocity increases. The solar wind density increase alone (without velocity increase) could not create the dayside aurora intensification.