利用CORONAS-F/SPIRIT的Mg XII实验数据研究X射线热点
Investigation of Hot X-ray Points (HXPs) Using Spectroheliograph Mg XII Experiment Data From CORONAS-F/SPIRIT
摘要：
CORONAS-F卫星上Mg XII 8.42 AA谱线的观测揭示了致密的高温物体-热X射线点（HXP），并对其主要物理参数进行了研究。测量了169个HXP的温度、发射测量、强度和电子密度的时间依赖性。HXP根据其温度变化可分为两组：逐渐降温组和快速降温组。HXPs等离子体温度在5-40 MK范围内，发射测量值为$10^{45}$ - $10^{48}$ cm $^{-3}$，电子密度高于$10^{10}$ cm $^{-3}$，这超过了安静太阳中的电子密度（$10^8$ - $10^9$ cm $^{-3}$）。HXP的寿命在5-100分钟之间变化，明显长于传导冷却时间。这意味着在HXP的整个寿命期间，能量释放过程会继续，这有助于保持其高温。HXP的热能不大于$10^{28}$ erg，并且在HXP中释放的总能量不超过$10^{30}$ erg。HXPs的物理性质不同于其他类似耀斑的微事件，如微耀斑，X射线亮点和纳米耀斑。
英文摘要：
Observations in the Mg XII 8.42 AA line onboard the CORONAS-F satellite have revealed compact high temperature objects-hot X-ray points (HXP)-and their major physical parameters were investigated. Time dependencies of temperature, emission measure, intensity, and electron density were measured for 169 HXPs. HXP can be divided into two groups by their temperature variations: those with gradually decreasing temperature and those with rapidly decreasing temperature. HXPs plasma temperatures lie in the range of 5-40 MK, the emission measure is $10^{45}$- $10^{48}$ cm$^{-3}$, and the electron density is above $10^{10}$ cm$^{-3}$, which exceeds the electron density in the quiet Sun ($10^8$-$10^9$ cm$^{-3}$). HXPs lifetimes vary between 5-100 minutes, significantly longer than the conductive cooling time. This means that throughout a HXP's lifetime, the energy release process continues, which helps to maintain its high temperature. A HXP's thermal energy is not greater than $10^{28}$ erg, and the total energy, which is released in HXPs, does not exceed $10^{30}$ erg. HXPs differ in their physical properties from other flare-like microevents, such as microflares, X-ray bright points, and nanoflares.
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