Heliospheric X-ray Emission Associated with Charge Transfer of the Solar Wind with Interstellar Neutrals
Heliospheric X-ray Emission Associated with Charge Transfer of the Solar Wind with Interstellar Neutrals
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DOI：
10.1086/312574
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发表时间：
2000-04
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影响因子：
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通讯作者：
T. Cravens
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文献类型：
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作者：
T. Cravens
X射线应该是在整个日球层中产生的，这是重（Z > 2）太阳风离子和星际中性粒子之间电荷转移碰撞的结果。这些碰撞产生的高电荷态太阳风离子处于高激发态，并发射极紫外线或软X射线光子。应用于彗星中性粒子的太阳风电荷交换机制已被用来解释从彗星观测到的软X射线发射。一个简单的模型表明，日球X射线辐射可以占观测到的软X射线背景强度的25%-50%。日光层X射线发射的空间和时间变化应反映太阳风通量和成分的变化以及日光层内星际中性粒子分布的变化。日光层X射线“本底”也许可以用ROSAT测量的软X射线本底的“长期增强”来确定。
X-rays should be generated throughout the heliosphere as a consequence of charge transfer collisions between heavy (Z > 2) solar wind ions and interstellar neutrals. The high charge state solar wind ions resulting from these collisions are left in highly excited states and emit extreme ultraviolet or soft X-ray photons. This solar wind charge exchange mechanism applied to cometary neutrals has been used to explain the soft X-ray emission observed from comets. A simple model demonstrates that heliospheric X-ray emission can account for about 25%-50% of the observed soft X-ray background intensities. The spatial and temporal variations of heliospheric X-ray emission should reflect variations in the solar wind flux and composition as well as variations in the distribution of interstellar neutrals within the heliosphere. The heliospheric X-ray "background" can perhaps be identified with the "long-term enhancements" in the soft X-ray background measured by ROSAT.