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首页> 外文期刊>Cosmic research >High-Speed Streams of the Solar Wind near the Earth's Orbit and Their Sources on the Sun according to Stereoscopic Observations in the Minimum of the 23rd Cycle
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High-Speed Streams of the Solar Wind near the Earth's Orbit and Their Sources on the Sun according to Stereoscopic Observations in the Minimum of the 23rd Cycle

机译：根据第23个周期最小周期中的立体观测，靠近地球轨道的太阳风高速流及其在太阳上的来源

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摘要

Based on the results of plasma and magnetic measurements at three different points of the helio-sphere and telescopic observations of the Sun from these points we study simultaneously high-speed streams (HSS) of the solar wind (SW) near the Earth's orbit and coronal holes (CH) that have generated them. The data from spacecraft STEREO-A, STEREO-B, ACE, and SOHO are used together with ground-based observations from March 2007 to May 2008. In this period there existed HSS whose sources represented CH of various polarity, geometry, and location relative to the heliographic and heliomagnetic equators. Dependence of SW parameters on mutual positions of spacecraft with respect to CH and heliospheric current sheet, and also on heliolatitude and geometry of the CH is revealed. A difference of more than 5° in locations of spacecraft with respect to the heliospheric current sheet in November 2007 allowed us to discover a heliolatitude velocity gradient of the SW streams between the STEREO-A and STEREO-B spacecraft. On the average this gradient at that time was equal to 20 km/s per degree. Substantial variations in SW streams associated with variations of the HSS SW sources during a few hours or days were also observed. This variability makes it difficult to use the data of spacecraft STEREO-B for sufficiently accurate prediction of SW properties in the near-Earth space by the method of simple advanced time shift due to heliolongitude difference between a spacecraft and the Earth even in solar activity minimum.
机译：基于在太阳球三个不同点的等离子体和磁测量结果以及从这些点对太阳的望远镜观测，我们同时研究了地球轨道和日冕附近的太阳风（SW）的高速流（HSS）产生它们的孔（CH）。从2007年3月至2008年5月，将航天器STEREO-A，STEREO-B，ACE和SOHO的数据与地面观测资料一起使用。在此期间，存在HSS，其来源表示各种极性，几何形状和相对位置的CH到射电赤道和日磁赤道。揭示了SW参数对航天器相对于CH和日球电流片的相互位置的依赖性，以及CH的高度和几何形状的依赖性。相对于2007年11月的日球电流表，航天器位置的差异超过5°，这使我们得以发现STEREO-A和STEREO-B航天器之间SW流的高度速度梯度。当时的平均坡度等于每度20 km / s。在几小时或几天内，还观察到与HSS SW源变化相关的SW流中的显着变化。这种可变性使得难以利用航天器STEREO-B的数据来通过近距离航天器和地球之间的日向度差产生的简单提前时移方法，即使在太阳活动最小的情况下，也无法通过简单的高级时移方法来充分准确地预测近地空间中的西南轨道特性。 。

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    《Cosmic research》 |2010年第1期|p.31-40|共10页
  • 作者

    I. S. Veselovsky; Yu. S. Shugay;

  • 作者单位

    Skobeltsyn Institute of Nuclear Physics, Moscow State University, Vorob'evy gory, Moscow, 119992 Russia Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117997 Russia;

    rnSkobeltsyn Institute of Nuclear Physics, Moscow State University, Vorob'evy gory, Moscow, 119992 Russia;

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