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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Location of high-altitude cusp during steady solar wind conditions
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Location of high-altitude cusp during steady solar wind conditions

机译：稳定的太阳风条件下高海拔风口的位置

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We have investigated the high-altitude cusp location and its dependence on the interplanetary magnetic field (IMF) B-z, solar wind B-y, and solar wind dynamic pressure during steady solar wind conditions. We have adopted strict event selection criteria, where we have studied only events during stationary IMF B-z, when the cusp latitude is supposed to be stationary. Prior to this study, the statistical studies have shown a great deal of scatter between the cusp latitude and the IMF B-z; however, with the strict event selection criteria, we have been able to reduce the scatter. The strongest source of scatter comes from large and largely fluctuating IMF B-y. When the events are selected during small IMF B-y, the scattering between the cusp latitude and the IMF B-z is reduced. When IMF is southward, also the fluctuation of IMF B-y has strong influence on the cusp latitude, whereas for northward IMF, the IMF B-y fluctuation has less influence on the cusp latitude. For larger southward IMF the cusp appears further equatorward than with smaller southward IMF. When the scatter is reduced by introducing the IMF B-y control, the larger northward IMF brings the cusp to lower latitudes than the smaller northward IMF, i.e., the maximum cusp latitude is obtained for small positive IMF B-z. For increasing solar wind E-y the cusp moves equatorward. Furthermore, with increasing solar wind dynamic pressure, the cusp appears at lower latitudes. This behavior depends on the orientation of the IMF B-z, with southward IMF the cusp moves faster equatorward than with northward IMF. [References: 34]
机译：我们研究了高空风口位置及其在稳定太阳风条件下对行星际磁场（IMF）B-z，太阳风B-y和太阳风动压的依赖性。我们采用了严格的事件选择标准，在该研究中，我们仅研究了固定IMF B-z时的尖峰纬度是固定的事件。在此研究之前，统计研究表明，尖峰纬度与IMF B-z之间存在很大的差异。但是，通过严格的事件选择标准，我们已经能够减少分散。分散的最强来源来自大型且波动很大的IMF B-y。当在小IMF B-y期间选择事件时，尖峰纬度和IMF B-z之间的散射会减小。当IMF向南时，IMF B-y的波动也对尖峰纬度有很大影响，而对于北向IMF，IMF B-y的波动对尖角纬度的影响较小。对于较大的IMF，与较小的IMF相比，尖点显得更赤道。当通过引入IMF B-y控制减小散射时，较大的北向IMF会比较小的北向IMF将尖峰带到较低的纬度，即，对于较小的正IMF B-z可获得最大的尖峰纬度。为了增加太阳风E-y，风口向赤道方向移动。此外，随着太阳风动压力的增加，尖点出现在较低的纬度。这种行为取决于IMF B-z的方向，向南移向IMF的尖点比向北移向IMF的快。 [参考：34]

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