IMF control of the location of Venusian bow shock: The effect of the magnitude of IMF component tangential to the bow shock surface
IMF control of the location of Venusian bow shock: The effect of the magnitude of IMF component tangential to the bow shock surface
复制标题
金星弓形激波位置的 IMF 控制：与弓形激波表面相切的 IMF 分量大小的影响
DOI：
10.1002/2014ja019878
复制
发表时间：
2014
影响因子：
2.8
通讯作者：
Barabash Stas
中科院分区：
文献类型：
--
作者：
Chai Lihui;Fraenz Markus;Wan Weixing;Rong Zhaojin;Zhang Tielong;Wei Yong;Dubinin Eduard;Zhong Jun;Han Xiuhong;Barabash Stas
冻结在太阳风中的行星际磁场（IMF）和太阳极紫外辐射可以显著影响金星弓形激波的位置。为了识别IMF对金星弓形激波的影响，我们研究了金星快车在异常长的太阳极小期（2006年5月至2010年12月）期间记录的1680次弓形激波穿越，其中太阳EUV变化的影响显着降低。我们的分析表明，在异常持久的太阳极小期，太阳EUV通量对金星弓形激波位置的影响可以忽略不计。太阳风动压和太阳风速度对金星弓形激波位置都没有明显的影响。然而，IMF震级对金星弓形激波的位置有很强的控制作用。我们发现，金星弓形激波的大小与切向于弓形激波表面的IMF分量的大小成线性关系，这种关系可以解释以前研究中发现的垂直平行不对称性和磁极赤道不对称性，以及本研究中发现的磁晨昏不对称性。
The interplanetary magnetic field (IMF) frozen in the solar wind, together with the solar EUV radiation, can significantly affect the location of Venusian bow shock. To recognize the IMF effect on the Venusian bow shock, we investigated 1680 bow shock crossings recorded by Venus Express during the unusually long‐lasting solar minimum (May 2006 to December 2010), of which the effect of solar EUV variation was significantly decreased. Our analysis shows that during the unusually long‐lasting solar minimum, the effect of the solar EUV flux on the Venusian bow shock location is negligible. Neither solar wind dynamic pressure nor solar wind velocity has observable effect on the Venusian bow shock location. However, the IMF magnitude has a strong control of the Venusian bow shock location. We found that the size of Venusian bow shock linearly increases with the magnitude of the IMF component tangential to the bow shock surface, and this relationship can account for the perpendicular‐parallel asymmetry and magnetic pole‐equator asymmetry found in previous researches, as well as the magnetic dawn‐dusk asymmetry discerned in this study.