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The day-glow data application of FY-3D IPM in monitoring O/N-2

机译:FY-3D IPM在监控O / N-2时的日光数据应用

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摘要

The Ionosphere Photometer (IPM) is a far ultraviolet nadir-viewing photometer that flew aboard the second-generation, polar-orbiting Chinese meteorological satellite FY-3D, which was launched on November 25th, 2017. The F-2 layer peak electron density (NmF2) and O/N-2 the column density ratio can be deduced by far ultraviolet measurements of night-time OI 135.6 nm emissions, which are produced by the recombination of O+ ions and electrons, and the day-time OI 135.6 nm and N2LBH wavelength emissions produced by the photoelectron impact excitation of atomic oxygen O and molecular nitrogen N-2. Analysis of the IPM data indicated the stray light at 135.6 nm wavelength is under deducted. Based on comparison with the emissive intensity calculation of AURIC model, the day-time data was conducted to make a revision of stray light. The reliable factor (1.13) of stray light subtraction was obtained by fitting the median values of the observed data points per each latitude bin to the model data. According to the O/N-2 error estimation from the estimated factor of the stray light, when the factor does not change by more than 0.03, the error of O/N-2 ratio from the factor will not exceed 20%. The O/N-2 changes retrieved from revised IPM data during storms in April and August 2018 are well correlated with Dst indices. The research results show that the IPM data could provide a good monitoring of O/N-2 changes during magnetic storms.
机译:电离仪光度计(IPM)是一款远的紫外线观察光度计,即在2017年11月25日推出的第二代,北极轨道中的中国气象卫星FY-3D。F-2层峰值电子密度( NMF2)和O / N-2柱密度比可以推导到夜间紫外线测量的夜间OI 135.6nm排放,这是由O +离子和电子的重组产生的,以及日期oi 135.6nm和n2lbh产生由原子氧O和分子氮N-2产生的光电子冲击激发产生的波长排放。分析IPM数据指示在扣除135.6nm波长下的杂散光。基于与Auric模型的发光强度计算的比较,进行日期数据以修订杂散光。通过将每个纬度箱子的观察到的数据点的中值值拟合到模型数据来获得杂散轻微减法的可靠因子(1.13)。根据来自杂散光的估计因子的O / N-2误差估计,当因子不变超过0.03时,距离因子的O / N-2比的误差不超过20%。从2018年4月和2018年8月期间从修订的IPM数据中检索的O / N-2变化与DST指数完全相关。研究结果表明,IPM数据可以在磁风暴期间对O / N-2变化进行良好监测。

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