Magnetopause location under extreme solar wind
Magnetopause location under extreme solar wind
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发表时间：
1998
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通讯作者：
J. Shue;P. Song;C. Russell;J. Steinberg;J. Chao;T. Detman;G. ZastenkerO;L. Vaisberg
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文献类型：
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作者：
J. Shue;P. Song;C. Russell;J. Steinberg;J. Chao;T. Detman;G. ZastenkerO;L. Vaisberg
在太阳风动压增强期间，1997年1月11日0200UT左右，在1月6-11日磁云事件结束时，磁层顶被推入地球同步轨道。LANL1994-084和GMS4地球同步卫星穿过磁层顶进入磁鞘.此外，GeoTail卫星位于磁鞘内，而Interball I卫星观测到了磁层顶交叉。这次活动提供了一个极好的机会来测试和验证用于制作空间天气预报的磁层顶位置现有模型的预测能力和准确性。在本文中，我们比较了两个模型：Petrinec and Russell(1996)模型和$hue等人的预测。(1997)模型。这两个模型正确地预测了日侧的磁层顶交叉点；然而，沿侧翼的预测有一些不同。$hue等人。(1997)模型正确地预测了地尾磁层顶交叉点，并部分地预测了球间I交叉点。Petrinec和Russell(1996)模型正确地预测了第一球之间的交叉，并与GeoTail的观测结果部分一致。我们进一步发现，Shue等人的S预测的一些不准确是由于从平均太阳风条件的参数范围到极端条件的参数范围的不适当的线性外推.为了改进极端太阳风条件下的预测，我们引入了参数对太阳风条件的非线性依赖来表示太阳风动压对磁层顶爆发的饱和效应和行星际磁场B的饱和效应对太阳下距离的影响.这些变化使得对这次事件的观测与Interball I的观测更一致.
During the solar wind dynamic pressure enhancement, around 0200 UT on January 11, 1997, at the end of the January 6-11 magnetic cloud event, the magnetopause was pushed inside geosynchronous orbit. The LANL 1994-084 and G MS 4 geosynchronous satellites crossed the magnetopause and moved into the magnetosheath. Also, the Geotail satellite was in the magnetosheath while the Interball i satellite observed magnetopause crossings. This event provides an excellent opportunity to test and validate the prediction capabilities and accuracy of existing models of the magnetopause location for producing space weather forecasts. In this paper, we compare predictions of two models: the Petrinec and Russell (1996) model and the $hue et al. (1997) model. These two models correctly predict the magnetopause crossings on the dayside; however, there are some differences in the predictions along the flank. The $hue et al. (1997) model correctly predicts the Geotail magnetopause crossings and partially predicts the Interball i crossings. The Petrinec and Russell (1996) model correctly predicts the Interball i crossings and is partially consistent with the Geotail observations. We further found that some of the inaccuracy in Shue et al.'s predictions is due to the inappropriate linear extrapolation from the parameter range for average solar wind conditions to that for extreme conditions. To improve predictions under extreme solar wind conditions, we introduce a nonlinear dependence of the parameters on the solar wind conditions to represent the saturation effects of the solar wind dynamic pressure on the flaring of the magnetopause and saturation effects of the interplanetary magnetic field B on the subsolar standoff distance. These changes lead to a better agreement with the Interball i observations for this event.