Measurements and IRI model predictions during the recent solar minimum
Measurements and IRI model predictions during the recent solar minimum
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DOI：
10.1016/j.jastp.2012.06.010
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发表时间：
2012-09-01
影响因子：
1.9
通讯作者：
Roddy, Patrick A.
中科院分区：
文献类型：
--
作者：
Bilitza, Dieter;Brown, Steven A.;Roddy, Patrick A.
第 23 周期的特殊之处在于，它比之前的周期持续了近两年，而且它以延长的最短期限结束，证明所有预测都是错误的。将国际参考电离层 (IRI) 与 CHAMP 和 GRACE 电子密度最低值原位测量结果进行比较，发现在 400-500 km 高度处存在显着差异（Luhr 和 Xiong，2010）。我们的研究借助电离探空仪和来自通信/导航中断预报系统 (C/NOFS) 卫星的平面朗缪尔探针 (PLP) 数据调查了这些差异的原因。我们的 C/NOFS 比较证实了早期的 CHAMP 和 GRACE 结果。但电离探空仪测量的 F 峰值等离子体频率 (foF2) 在整个太阳周期中总体上表现出良好的一致性。中纬度站数据模型差异的年平均值在 10% 以内，低纬度站则在 20% 以内。在 400-500 公里高度处发现的 60-70% 的差异在 F 峰值上看不到。我们将讨论如何解释电离探空仪和原位数据模型比较的这些看似矛盾的结果，以及 IRI 模型中需要校正哪些参数。 (C) 2012 Elsevier Ltd. 保留所有权利。
Cycle 23 was exceptional in that it lasted almost two years longer than its predecessors and in that it ended in an extended minimum period that proved all predictions wrong. Comparisons of the International Reference Ionosphere (IRI) with CHAMP and GRACE in-situ measurements of electron density during the minimum have revealed significant discrepancies at 400-500 km altitude (Luhr and Xiong, 2010). Our study investigates the causes for these discrepancies with the help of ionosonde and Planar Langmuir Probe (PLP) data from the Communications/Navigation Outage Forecasting System (C/NOFS) satellite. Our C/NOFS comparisons confirm the earlier CHAMP and GRACE results. But the ionosonde measurements of the F-peak plasma frequency (foF2) show generally good agreement throughout the whole solar cycle. At mid-latitude stations yearly averages of the data-model difference are within 10% and at low latitudes stations within 20%. The 60-70% differences found at 400-500 km altitude are not seen at the F peak. We will discuss how these seemingly contradicting results from the ionosonde and insitu data-model comparisons can be explained and which parameters need to be corrected in the IRI model. (C) 2012 Elsevier Ltd. All rights reserved.