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首页> 外文期刊>Advances in space research >NmF2 trends at low and mid latitudes for the recent solar minima and comparison with IRI-2012 model
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NmF2 trends at low and mid latitudes for the recent solar minima and comparison with IRI-2012 model

机译：中低纬度NmF2趋势与最近的太阳最低值以及与IRI-2012模型的比较

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摘要

The ionospheric electron density peak (NmF2) is analyzed for the recent minima of solar activity for two mid-latitude stations, Rome (41.8°N, 12.5°E, geomagnetic latitude 41.7°N, Italy) and Gibilmanna (37.9°N, 14.0°E, geomagnetic latitude 37.6°N, Italy), and for the low-latitude station of Tucumán (26.9°S, 294.6°E, geomagnetic latitude 17.2°S, Argentina), located in the south ridge of the equatorial ionization anomaly. An inter-minima comparison reveals that from an ionospheric point of view the last minimum of solar activity (minimum 23/24) was peculiar, with values of NmF2 lower than those recorded during the previous minima for all the stations and all the hours of the day. A more pronounced decrease is observed at Tucumán than at Rome and Gibilmanna. The study of the winter and semi-annual anomaly shows that at mid-latitude stations the winter anomaly is not visible only for the years 2008 and 2009, which represent the deeper part of the prolonged and anomalous last solar minimum. The same is for the semi-annual anomaly. A comparison with the version 2012 of the International Reference Ionosphere model (IRI) is also carried out. The results reveal that for low solar activity the model works better at mid latitudes than at low latitudes, confirming the problems of IRI in correctly representing the low-latitude ionosphere. Nevertheless, using as input updated values of the solar and geomagnetic indices, no loss of accuracy is detected in the IRI performances for the last solar minimum with respect to the previous ones, both at mid and low latitudes.
机译：针对两个中纬度站点罗马（41.8°N，12.5°E，地磁纬度41.7°N，意大利）和吉比尔马纳（37.9°N，14.0）的最近太阳活动极小值，分析了电离层电子密度峰值（NmF2） °E，意大利的地磁纬度37.6°N）和位于赤道电离异常南脊的Tucumán低纬度站（26.9°S，294.6°E，地磁纬度17.2°S，阿根廷）。最小值之间的比较显示，从电离层的角度来看，太阳活动的最后最小值（最小值23/24）是特殊的，NmF2的值低于上一个最小值的所有站点和时段的NmF2值。天。在图库曼，观察到的下降比在罗马和吉比尔曼纳的下降更为明显。对冬季和半年度异常的研究表明，在中纬度站，只有在2008年和2009年才看不到冬季异常，这代表了长期和反常的最后一次太阳最低值的更深部分。半年异常也是如此。还与国际参考电离层模型（IRI）的2012版进行了比较。结果表明，对于低太阳活动，该模型在中纬度下比在低纬度下更有效，这证实了IRI在正确表示低纬度电离层方面存在的问题。然而，使用太阳和地磁指数的更新值作为输入，在中纬度和低纬度下，相对于先前的最低太阳辐射强度而言，IRI性能中没有检测到精度损失。

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  • 来源
    《Advances in space research》 |2017年第2期|363-374|共12页
  • 作者

    Perna L.; Pezzopane Michael; Ezquer Rodolfo G.; Cabrera Miguel Angel; Baskaradas James Arokiasamy;

  • 作者单位

    Università di Bologna “Alma Mater Studiorum”, Viale Berti Pichat 6/2, Bologna, Italy,Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Roma, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, Roma, Italy;

    CIASUR, Facultad Regional Tucumán, Universidad Tecnológica Nacional, Tucumán, Argentina,Laboratorio de Ionósfera, Dto. De Fisica, FACET, Universidad Nacional de Tucumán, Indipendencia 1800, Tucumán, S.M., Argentina,CONICET, Buenos Aires, Argentina;

    CIASUR, Facultad Regional Tucumán, Universidad Tecnológica Nacional, Tucumán, Argentina,Laboratorio de Telecomunicaciones, FACET, Universidad Nacional de Tucumán, Indipendencia 1800, Tucumán, S.M., Argentina;

    SAP, School of Electrical and Electronics Engineering, SASTRA University, Thirumalaisamudram, Thanjavur, Tamil Nadu, India;

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  • 关键词

    Ionosphere; Ionospheric electron density peak; IRI model; Solar cycle; Solar minimum;

    机译：电离层;电离层电子密度峰值;IRI模型;太阳周期;太阳最低;

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