Topside Ionospheric Electron Temperature Observations of the 21 August 2017 Eclipse by DMSP Spacecraft
Topside Ionospheric Electron Temperature Observations of the 21 August 2017 Eclipse by DMSP Spacecraft
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DOI：
10.1029/2018gl077381
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发表时间：
2018-08
影响因子：
5.2
通讯作者：
M. Hairston;S. Mrak;W. Coley;A. Burrell;B. Holt;M. Perdue;M. Depew;R. Power
中科院分区：
文献类型：
--
作者：
M. Hairston;S. Mrak;W. Coley;A. Burrell;B. Holt;M. Perdue;M. Depew;R. Power
在2017年8月21日日食期间，两个独立的DMSP航天器在当地下午（F16）和当地日落（F17）在约850公里的高度上穿过月球半影。每一个航天器上的朗缪尔探测器对现场电子温度的测量表明，阴影中的温度下降了500至1，000 K。这些减少的模式在阴影内是零星的，但通常在两个通道中显示出相同的整体形状。将这些温度降低的模式与太阳极紫外辐射在电离层中的梯度投影进行比较表明，这些复杂的模式是日食时太阳极紫外辐射在太阳上的不均匀分布的结果。
During the 21 August 2017 eclipse two separate DMSP spacecraft passed through the lunar penumbra at local afternoon (F16) and near local sunset (F17) in the topside ionosphere at an altitude of ~850 km. Measurements of the in situ electron temperature by the Langmuir probe on each spacecraft showed regions where the temperature decreased on the order of 500 to 1,000 K in the shadow. The patterns of these decreases were sporadic inside the shadow but generally showed the same overall shape in both passes. Comparing these patterns of temperature reductions with the projection of the gradient of the solar EUV radiation in the ionosphere suggests that these complex patterns are a result of the nonuniform distribution of the solar EUV radiation on the Sun at the time of the eclipse.