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首页> 外文期刊>Journal of atmospheric and solar-terrestrial physics >Morphological study on the ionospheric variability at Bharati, a polar cusp station in the southern hemisphere
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Morphological study on the ionospheric variability at Bharati, a polar cusp station in the southern hemisphere

机译：南半球南半球尖尖站Bharati电离层变异的形态学研究

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摘要

Morphological features of the quiet/disturbed time variations in the Total Electron Content (TEC) at the polar cusp station Bharati (76.69 degrees S MLAT) during a period of 5 years starting from February 2013 to December 2017 has been studied using GPS TEC measurements. The TEC at Bharati follows a diurnal pattern with its peak appearing close to local noon/magnetic noon during the summer/winter months. A nighttime enhancement in the TEC is seen around the magnetic midnight during winter. The plasma density at Bharati also exhibits semiannual variation and a strong dependence on solar activity. A comparison of the IRI 2016 model derived TEC and the GPS TEC at Bharati shows significant differences with large underestimation of TEC especially during the nighttime period of the winter months. A two fold difference in magnitude between the GPS and modeled TEC is also observed in the summer months of the high solar activity period of 2013-2015. The response of the TEC to geomagnetic storms is found to depend on the onset time of the storm. We show that the morphological features in the temporal evolution of the plasma density at Bharati vary as the location of Bharati changes from being inside the polar cap, to the auroral region, and to the polar cusp in quick succession in a day. Our results highlight the fact that the dynamic nature of the location of Bharati with respect to the position of the polar cap plays an important role in deciding the plasma distribution at the polar cusp station.
机译：在2013年2月至2017年2月开始的5年期间，极地尖端站Bharati（76.69摄氏甚至76.69摄氏）的整体电子含量（TEC）的形态特征已经使用GPS TEC测量研究。 Bharati的TEC在夏季/冬季期间靠近当地中午/磁中午靠近当地的中午/磁性中午的昼夜模式。在冬季摩托车午夜周围看到TEC中的夜间增强。 Bharati的等离子体密度也表现出半年变异和对太阳能活动的强烈依赖。 IRI 2016模型的比较衍生的TEC和BHARATI的GPS TEC显示出显着差异，尤其是在冬季的夜间期间的大量低估。 2013 - 2015年高太阳能活动期的夏季也观察到GPS和建模TEC之间的两个倍数差异。发现TEC对地磁风暴的响应取决于风暴的起始时间。我们表明，BHARATI在BHARATI的等离子体密度的时间演变中的形态学特征随着BHARATI在极性帽内部的变化而变化到极光区域，以及在一天内快速地连续的极性尖端的位置。我们的结果强调了Bharati相对于极性帽的位置的位置的动态性质在决定极地尖端站的等离子体分布方面起着重要作用。

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