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HELIOSPHERIC IMAGES OF THE SOLAR WIND AT EARTH

机译:太阳风的地球球面影像

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摘要

During relatively quiet solar conditions throughout the spring and summer of 2007, the SECCHI HI2 white-light telescope on the STEREO B solar-orbiting spacecraft observed a succession of wave fronts sweeping past Earth. We have compared these heliospheric images with in situ plasma and magnetic field measurements obtained by near-Earth spacecraft, and we have found a near perfect association between the occurrence of these waves and the arrival of density enhancements at the leading edges of high-speed solar wind streams. Virtually all of the strong corotating interaction regions are accompanied by large-scale waves, and the low-density regions between them lack such waves. Because the Sun was dominated by long-lived coronal holes and recurrent solar wind streams during this interval, there is little doubt that we have been observing the compression regions that are formed at low latitude as solar rotation causes the high-speed wind from coronal holes to run into lower speed wind ahead of it.
机译:在2007年春季和夏季相对安静的太阳条件下,STEREO B太阳轨道航天器上的SECCHI HI2白光望远镜观测到一系列波阵面掠过地球。我们将这些日球图像与近地航天器获得的原位等离子体和磁场测量值进行了比较,并且我们发现了这些波的出现与高速太阳前缘密度增强的到达之间的近乎完美的联系。风。几乎所有的强同向相互作用区域都伴随着大范围的波浪,而它们之间的低密度区域则没有这种波浪。因为在此间隔期间,太阳由长寿命冠冕孔和反复出现的太阳风所控制,所以毫无疑问,我们一直在观察低纬度形成的压缩区域,因为太阳旋转会导致冠冕孔产生高速风在它前面遇到低速风。

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