在阿根廷低纬度太阳活动高和低时F2-layer峰特征的变化和与IRI-2016模式的比较
Variability of F2-layer peak characteristics at low latitude in Argentina for high and low solar activity and comparison with the IRI-2016 model
摘要：
本工作介绍了南美洲低纬度台站（图库曼，26.9°S，294.6°E;阿根廷磁纬15.5°S）foF 2和hmF 2的变率研究。在不同的季节和太阳活动条件下（2009年太阳活动低的一年和2016年太阳活动高的一年）获得的地面电离层探测仪测量值被认为是为了比较电离层行为。用于分析变异性的参数为中位数、上四分位数和下四分位数。此外，foF 2值与国际参考电离层（IRI）- 2016模型估计的值进行了比较。结果表明：（1）foF_2和hmF_2对太阳活动有明显的依赖性，随太阳活动的增加而增加; b）在低太阳活动时，foF 2的变化性较高，在两个时期呈现类似变化性的hmF 2中没有观察到这种行为。c）foF 2的变化在夜间比白天更大，这种行为在太阳活动高峰期更明显。d）foF 2的变异性高于hmF 2。e）在太阳活动高、低时，观测到约2天和5天的显著行星波谱峰。f）总体而言，IRI在白天高估foF 2，在日落后低估foF 2，夜间的一致性较好。
英文摘要：
This work presents the study of the variability of foF2 and hmF2 at a low latitude station in South America (Tucumán, 26.9°S, 294.6°E; magnetic latitude 15.5°S, Argentina). Ground based ionosonde measurements obtained during different seasonal and solar activity conditions (a year of low solar activity, 2009 and one of high solar activity, 2016) are considered in order to compare the ionospheric behavior. The parameters used to analyze the variability are the median, upper and lower quartiles. In addition, the foF2 values are compared with those estimated by the International Reference Ionosphere (IRI) - 2016 model. It is found that: a) A clear dependence on solar activity is observed in foF2 and hmF2, both increase with increase in solar activity. b) the variability of foF2 is higher at low solar activity, this behavior is not observed in hmF2 that present similar variability during both periods. c) the variability of foF2 is larger at night than during the day, this behavior is more pronounced during the high solar activity period. d) The variability of foF2 is higher than that of hmF2. e) Significant planetary wave spectral peaks at about 2 and 5 days are observed at high and low solar activity. f) In general, IRI overestimates foF2 during daytime, and underestimates it at post-sunset period, a better agreement is shown during nighttime.
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