FY-3D 电离层光度计IPM对2024年5月11日特大磁暴的响应研究
doi: 10.11728/cjss2025.04.2024-0079 cstr: 32142.14.cjss.2024-0079
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江芳 女, 1977年1月生于江苏省淮安市, 现为中国科学院国家空间科学中心副研究员, 主要研究方向为中高层大气光学遥感研究. E-mail: jiangf@nssc.ac.cn -
付利平 女, 1972年3月生于湖北省武汉市, 现为中国科学院国家空间科学中心研究员, 博士生导师, 主要从事中高层大气光学遥感探测研究. E-mail: fuliping@nssc.ac.cn
作者简介:
通讯作者:
Study of FY-3D Ionospheric Photometer (IPM) Response to the Extreme Magnetic Storm on 11 May 2024
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摘要: 远紫外气辉探测仪小型电离层光度计IPM随FY-3D卫星于2017年11月15日发射升空, 通过对地测量夜间O+和电子辐射复合产生的135.6 nm辉光辐射、白天光电子碰撞激发产生的OI 135.6 nm 和N2 LBH辉光辐射, 可以反演得到夜间峰值电子密度NmF2、白天大气氧原子与氮气分子的柱密度比O/N2等重要参数. 本文对2024年5月11日特大磁暴事件中IPM的数据响应进行分析, 对白天数据的研究结果表明, 本次磁暴事件过程中, O/N2在各个纬度较磁平静日均是减小的, 可用于解释IGS(International GNESS Service) TEC在各纬度大多呈现的负暴效应. 对夜间数据研究发现,磁暴日夜间135.6 nm辐射强度相对磁平静日呈现各纬度的增大, 增大幅度可达3个数量级, 且从磁暴主相开始一直持续到恢复相, 而对应的TEC数据并没有如此大的增强; 另外, 测量190 nm以上波长辐射贡献的夜间杂散光通道在磁暴日也相应地增强, 而这一波段的辐射机制与电离层并无直接关联.
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关键词:
- Dst指数 /
- 135.6 nm辉光辐射 /
- N2 LBH带辉光辐射 /
- O/N2
Abstract: With the launch of the FY-3D satellite on 15 November 2017, the Far Ultraviolet Ionospheric Photometer (IPM) on board enables measurements of nighttime 135.6 nm airglow emissions generated by the recombination of O+ ions and electrons, as well as daytime emissions from OI 135.6 nm and N2 LBH due to photoelectron impact on atomic oxygen and molecular nitrogen. These measurements can obtain the key parameters such as nighttime peak electron density NmF2 and daytime O/N2. The paper analyzes the response of IPM data during the extreme magnetic storm event on 11 May 2024. The study results of daytime data indicate that during the event, the O/N2 decreased at all latitudes compared to geomagnetically quiet days. This finding can be used to explain the negative storm effects observed in IGS TEC. the study of nighttime data reveals that during magnetic storms, the intensity of 135.6 nm increases significantly across all latitudes compared to geomagnetically quiet days, with an increase by up to three orders of magnitude. The enhancement persists from the storm main phase through the recovery phase. However, corresponding TEC data does not show such a pronounced increase. Furthermore, the stray light channel measuring radiation contribution above 190 nm wavelength also exhibits a significant increase during magnetic storm days. This further indicates that the enhancement of nighttime 135.6 nm radiation is not solely derived from ionospheric contributions.-
Key words:
- Dst index /
- 135.6 nm airglow emissions /
- N2 LBH airglow emission /
- O/N2
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图 2 IPM在135.6 nm和N2 LBH通道的响应曲线
Figure 2. Response curves for 135.6 nm channel and N2 LBH channel
图 3 N2柱密度水平为1017 cm–2、太阳天顶角为0°时模拟IPM 135.6 nm和N2 LBH辐射强度的比值与O/N2的相关性曲线
Figure 3. IPM 135.6 nm/N2 LBH intensity ratios versus the O/N2 column density ratios reference at a N2 column density level of 1017 cm–2 for the zero degree Solar Zenith Angle
图 4 IPM反演的O/N2在2024年5月11日前后的全球分布
Figure 4. O/N2 by IPM global distribution around 11 May 2024
图 5 IGS TEC在2024年5月11日前后的全球分布
Figure 5. IGS TEC global distribution around 11 May 2024
图 6 2024年5月11日各纬度区间的O/N2(蓝线)及TEC(红线)均值相对磁平静日对应纬度均值的变化
Figure 6. Mean value of O/N2 (The blue line) and the mean total electron content (TEC) for various latitude intervals (the red line) around 11 May 2024. The changes are relative to the mean values of corresponding latitudes during geomagnetically quiet days
图 7 2024年5月8～12日IPM测量的夜间135.6 nm通道辐射强度、夜间杂散光通道计数值、IGS TEC及Dst指数随时间的分布
Figure 7. Distribution of nighttime 135.6 nm channel radiation intensity, nighttime stray light channel count values, IGS TEC and Dst index measured by IPM from 8 to 12 May 2024
图 8 2024年5月11日前后各纬度区间的135.6 nm辐射强度及TEC均值平方相对磁平静日对应纬度均值的变化
Figure 8. Changes in the square of the mean values of 135.6 nm radiation intensity and TEC for various latitude intervals around 11 May 2024 relative to the mean values of corresponding latitudes during geomagnetically quiet days
图 9 2023年4月20～24日IPM测量的夜间135.6 nm通道辐射强度、IGS TEC及Dst指数随时间的分布
Figure 9. Distribution of nighttime 135.6 nm channel radiation intensity, IGS TEC and Dst index measured by IPM from 20 to 24 April 2023
表 1 滤光片轮各通道信息
Table 1. Filter wheel and channel information
通道号 滤光片 测量波段 工作模式 1 挡板 暗计数 白天/夜间 2 带通滤光片(中心波长: 135.6 nm) 135.6 nm 白天 3 带通滤光片(中心波长: 160 nm) LBH 白天 4 滤光片(190 nm以上波长) 带外光 白天 5 孔 135.6 nm 夜间 6 石英 带外光 夜间 
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