FIRI‐2018, an Updated Empirical Model of the Lower Ionosphere
FIRI‐2018, an Updated Empirical Model of the Lower Ionosphere
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FIRI‐2018，更新的低电离层经验模型
DOI：
10.1029/2018ja025437
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
K. Torkar
中科院分区：
文献类型：
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作者：
M. Friedrich;C. Pock;K. Torkar
从地面很难进入低电离层，但探空火箭的现场测量也有其局限性。非极光电离层的半经验模型FIRI（法拉第-国际参考电离层）最初发表于2001年，基于低电离层的简单离子化学模型，其输出由有限数量的可靠原位火箭测量进行调整，所有测量都基于波传播方法。从那时起，一些数据被发现是有问题的，但可以用大约相同数量的可信数据代替。此外，根据朗缪尔探测器获得了大量的电子密度分布图，覆盖51至90公里的高度范围。这些数据用于向下扩展FIRI，提供否则根本无法覆盖的区域的结果。注意这些数据不会损害波传播数据所涵盖的高度，因为波传播数据不受空气动力学和有效载荷潜在效应的影响。由此产生的半经验模型可作为1980年60至150公里高度之间电子密度的分布图（11个太阳天顶角从0至130°，纬度0°、15°、30°、45°和60°，三个太阳活动和每个月中）。
The lower ionosphere is difficult to access from the ground, but also, in situ measurements by sounding rockets have their limitations. The semiempirical model of the nonauroral ionosphere FIRI (Faraday‐International Reference Ionosphere) was originally published in 2001 and is based on a simple ion‐chemical model of the lower ionosphere whose output is adjusted by the limited number of reliable in situ rocket measurements, all based on wave propagation methods. Since then some of the data were found to be questionable but could be replaced by about the same number of trustworthy data. In addition, a large number of electron density profiles based on Langmuir probes became available covering the altitude range from 51 to 90 km. These data are used to extend FIRI downward, providing results in a region that would otherwise not be covered at all. Caution was taken that these data do not impair the altitudes covered by wave propagation data which are unaffected by aerodynamic and payload potential effects. The resulting semiempirical model is available as 1980 profiles of electron densities between 60 and 150 km altitude (for 11 solar zenith angles from 0 to 130°, latitudes 0°, 15°, 30°, 45° and 60°, for three solar activities and the middle of each month).