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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Seasonal dependence and solar wind control of transpolar arc luminosity
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Seasonal dependence and solar wind control of transpolar arc luminosity

机译：季节性的依赖和太阳风的控制经过北极的弧光度

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The influence of the solar wind and the interplanetary magnetic field (IMF) on the luminosity of transpolar arcs (TPAs) is examined by taking into account seasonal effects. The study focuses on those transpolar arcs that appear after an IMF B y sign change during steady northward IMF. It includes 21 northern hemisphere events identified in a previous study from global UV images taken by the Polar spacecraft between 1996 and 2000. Sorting the TPA events by sign of the Earth dipole tilt we find that the TPAs which appear in the dark hemisphere are on average much weaker than TPAs in the sunlit hemisphere. For the dark hemisphere events, no clear correlation between solar wind parameters and TPA luminosity is found. However, in the sunlit hemisphere, a clear dependence on solar wind and IMF conditions is seen. The TPA brightness is strongly influenced by IMF magnitude, northward IMF B z and solar wind speed. A weak, negative correlation with the ion density is found. The TPA luminosity in the sunlit hemisphere is much more strongly controlled by the magnetic energy flux than by the kinetic energy flux of the solar wind. This explains the absence of transpolar arcs for the two B y sign change cases for positive dipole tilts with lowest magnetic energy flux values. The strong influence of the Earth dipole tilt on the transpolar arc luminosity appears due to the dependence of the ionospheric conductivity on solar EUV emissions.
机译：太阳风和的影响行星际磁场(IMF)经过北极的弧的光度(tpa)检查考虑到季节性的影响。研究的重点是那些经过北极的弧线出现在国际货币基金组织B y变化稳定的迹象国际货币基金组织(IMF)向北。从全球事件中确定一项研究UV之间的极性飞船所拍摄的图像1996年和2000年。地球偶极子我们发现tpa倾斜出现在黑暗半球平均弱于tpa在阳光照射的半球。黑暗半球事件,没有明确的相关性太阳风参数和TPA光度之间是发现。明确依赖太阳风和国际货币基金组织的条件是见过的。受到国际货币基金组织的大小的影响,国际货币基金组织(IMF)向北B z和太阳风速度。与离子密度存在相关性。TPA光度在阳光照射的半球由磁场能量控制通量比动能通量的太阳能风。弧的两个B y变化情况积极的偶极子倾斜磁场能量最低流量值。偶极子在经过北极的弧光度倾斜由于电离层的依赖对太阳能EUV排放电导率。

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