Anomalous electron density events in the quiet summer ionosphere at solar minimum over Millstone Hill
Anomalous electron density events in the quiet summer ionosphere at solar minimum over Millstone Hill
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DOI：
10.1007/s00585-998-0460-8
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发表时间：
1998-04
影响因子：
1.9
通讯作者：
A. Pavlov;M. Buonsanto
中科院分区：
文献类型：
--
作者：
A. Pavlov;M. Buonsanto
本研究将Millstone Hill上空F区电离层的观测行为与1986年6月23-25日地磁平静期太阳极小期IZMIRAN模式的计算结果进行了比较，当时观测到hmF 2的异常低值（<200 km）。我们发现，这些低值的hmF 2（被视为G条件电离图）存在于电离层中，由于生产率的氧离子的原子氧密度的低值导致的下降。结果表明，使用非相干散射雷达数据的G条件的确定是敏感的O+相对于分子离子的真实浓度，并在数据减少过程中假设的离子组成模型。由于振动激发N2导致O++ N2损失率增加，NmF 2通常减少5-10%，但高达15%，使模型和数据更好地吻合。振动激发NO+离子对电子密度的影响是可以忽略不计的。关键词。电离层（离子化学和组成;电离层-大气相互作用;中纬度电离层）。
This study compares the observed behavior of theFregion ionosphere over Millstone Hill with calculations from the IZMIRAN model for solar minimum for the geomagnetically quiet period 23-25 June 1986, when anomalously low values ofhmF2(<200 km) were observed. We found that these low values ofhmF2(seen as a G condition on ionograms) exist in the ionosphere due to a decrease of production rates of oxygen ions resulting from low values of atomic oxygen density. Results show that determination of a G condition using incoherent scatter radar data is sensitive both to the true concentration of O+relative to the molecular ions, and to the ion composition model assumed in the data reduction process. The increase in the O++ N2loss rate due to vibrationally excited N2produces a reduction inNmF2of typically 5-10% , but as large as 15% , bringing the model and data into better agreement. The effect of vibrationally excited NO+ions on electron densities is negligible.Key words.Ionosphere (Ion chemistry and composition; Ionosphere-atmosphere interactions; Mid-latitude ionosphere).