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Comparison of the ionospheric F peak parameters obtained by PARUS ionosonde with IRI model for the Alma-Ata midlatitude station

机译:PARUS离子探空仪获得的电离层F峰参数与IRI模型对Alma-Ata中纬度站的比较

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摘要

The data recorded by the Alma-Ata ionosonde [43.25N, 76.92E] are used to compare the critical frequency (foF2) and the F peak height (hmF2), calculated by using the standard program POLAN, with the latest version of the International Reference Ionosphere (IRI) model (http://omniweb.gsfc.nasa.gov/vitmo/iri2012_vitmo.html) for the recent solar minimum, the years 2008–2010. Diurnal variations of the F peak parameters and those defined values from IRI model prediction were compared for representative months of winter (January), equinoxes (March, September), and summer (July) seasons. The URSI model was used as an IRI option. It was found that for the Alma-Ata (Kazakhstan) location the morphology of seasonal and diurnal variations of the foF2 and hmF2 monthly medians the new IRI model describes quite well but underestimates the F2-layer critical frequency (approximately 30%) during winter and equinox seasons especially for nighttime, pre-sunrise and post-sunset periods. The F-layer peak heights are usually underestimated in all seasons for daytime (approximately 10–30 km), except the daytime in summer (up to 100 km), and overestimated for nighttime (approximately 5–30 km). Modeled and “real” TEC values for the altitude range from 50 km to 2000 km were calculated correspondingly without and with using the optional true foF2 and hmF2 values in the IRI model. Deviations between the modeled and “real” TEC values are found to be in the range of 47–55%.
机译:Alma-Ata离子探空仪[43.25N,76.92E]记录的数据用于将临界频率(foF2)和F峰高(hmF2)(使用标准程序POLAN计算)与国际标准的最新版本进行比较。关于最近的太阳最低峰(2008-2010年)的参考电离层(IRI)模型(http://omniweb.gsfc.nasa.gov/vitmo/iri2012_vitmo.html)。比较了冬季(1月),春分(3月,9月)和夏季(7月)的代表性月份的F峰参数的日变化和IRI模型预测的定义值。 URSI模型用作IRI选项。研究发现,对于Alma-Ata(哈萨克斯坦)地区,foF2和hmF2月中值的季节性和昼夜变化的形态,新的IRI模型描述得很好,但低估了冬季和冬季F2层的临界频率(大约30%)。春分特别是在夜间,日出前和日落后时期。除夏季的白天(最长100 km)外,白天(大约10–30 km)的所有季节中,F层的峰值高度通常都被低估,而夜间(大约5–30 km)则高估了F层的峰值高度。在不使用IRI模型中的可选foF2和hmF2可选值的情况下,分别计算了从50 km至2000 km高度范围内的模型TEC值和“真实” TEC值。发现建模的TEC值与“实际” TEC值之间的差异在47%至55%之间。

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