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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku Observation of Strong Solar-Wind Charge-Exchange Emission from the Terrestrial Exosphere during a Geomagnetic Storm
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Suzaku Observation of Strong Solar-Wind Charge-Exchange Emission from the Terrestrial Exosphere during a Geomagnetic Storm

机译：朱雀观测到的地磁风暴期间，地球外圈强烈的太阳风电荷交换发射

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摘要

We present an analysis of X-ray data exhibiting strong solar-wind charge-exchange emission obtained with the Suzaku satellite during a geomagnetic storm that occurred on 2005 August 31. A temporal variation of diffuse soft X-ray emission, correlating with the solar-wind proton flux, was found. The diffuse emission consisted of exospheric solar-wind charge exchange (geocoronal SWCX). We extracted the variable component of the spectrum, which is dominated by a sum of C V, CVI, NVI, NVII, OVII, and OVIII emission lines, predicted by the theoretical SWCX model. An analysis of any time correlation between the solar wind and the OVII line flux was conducted using the solar-wind data taken with the ACE and WIND satellites. We found that the observed SWCX intensity was 4–10 times higher than that calculated using a model of exospheric hydrogen density, and the O~(7+) flux observed with ACE at the L1 point. This suggests that the exospheric hydrogen density can be higher than that predicted by the hydrogen model, and/or that additional O~(7+) ions to the measured ACE fluxes could exist in the magnetosphere. Comparing this observation to past incidences of SWCX emission, as recorded by Suzaku, it was found that the SWCX intensity in this observation was strong, in spite of the fact that the line-of-sight direction did not traverse thesub-solar magnetosheath nor the magnetospheric cusps, where higher SWCX emission would be expected.
机译：我们对2005年8月31日发生的地磁风暴期间，朱雀卫星获得的表现出强烈的太阳风电荷交换发射的X射线数据进行了分析。散射软X射线发射的时间变化与太阳辐射相关。发现风质子通量。漫射发射由大气外的太阳风电荷交换（地磁SWCX）组成。我们提取了光谱的可变成分，该成分由理论SWCX模型预测的C V，CVI，NVI，NVII，OVII和OVIII发射谱线的总和控制。利用ACE和WIND卫星获取的太阳风数据，对太阳风和OVII线通量之间的任何时间相关性进行了分析。我们发现，观测到的SWCX强度比使用大气外氢密度模型计算出的SWCX强度高出4-10倍，并且在ACE的L1点观测到的O〜（7+）通量更高。这表明，大气外的氢密度可能高于氢模型预测的氢密度，和/或磁层中可能存在对被测ACE通量额外的O〜（7+）离子。比较该观察结果与Suzaku记录的SWCX过去发生率，发现该观察结果中的SWCX强度很强，尽管视线方向既没有横过亚太阳电磁场也没有横越预计将产生更高的SWCX排放的磁层尖端。

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