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首页> 外文期刊>Planetary and space science >Experimental evidence of direct penetration of upstream ULF waves from the solar wind into the magnetosphere during the strong magnetic storm of November 9, 2004
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Experimental evidence of direct penetration of upstream ULF waves from the solar wind into the magnetosphere during the strong magnetic storm of November 9, 2004

机译：在2004年11月9日的强磁暴期间，上游ULF波从太阳风直接穿透进入磁层的实验证据

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摘要

Upstream ULF waves were recorded by the ACE satellite, while the Pc5 ULF waves (geomagnetic pulsations) were simultaneously observed by the COES12 satellite in the magnetosphere during the big magnetic storm on November 9, 2004. Their spectra showed similar structures with the maximum frequency band around 2.20-2.44 mHz. The upstream ULF waves were highly correlated with the Pc5 waves with a correlation coefficient of 0.82 for a time lag of 28.5 min. Both the interplanetary and the magnetospheric waves had intense radial components with very large-amplitude δB_r/B > 40%, which indicated characteristic of the compressional waves. Furthermore, variations of the plasma density were in phase with those in the magnetic field, suggesting that they were essentially magnetosonic waves. The results demonstrated that upstream magnetosonic waves in the solar wind can directly penetrate into the magnetosphere and cause the Pc5 ULF waves during a big magnetic storm. The penetration of the magnetosonic waves seems to be occurred merely around the noon sector.
机译：ACE卫星记录了上行ULF波，而COES12卫星在2004年11月9日的大磁暴期间在磁层中同时观测到了Pc5 ULF波（地磁脉动）。它们的频谱显示了具有最大频带的相似结构约为2.20-2.44 mHz。上游ULF波与Pc5波高度相关，相关系数为0.82，持续时间为28.5分钟。行星际波和磁层波都具有强烈的径向成分，其幅值δB_r/ B> 40％很大，这表明了压缩波的特性。此外，等离子体密度的变化与磁场中的变化同相，表明它们本质上是磁声波。结果表明，在大磁暴期间，太阳风中的上游磁声波可以直接穿透磁层并引起Pc5 ULF波。磁声波的渗透似乎仅发生在中午部分附近。

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