The total electron content (TEC) is a key parameter that is used to understand the effects of ionosphere on satellite-based navigation and communication signals. The ionosphere at polar is highly dynamic and acts as a major sink for the solar-terrestrial energy transfer processes, different magnetospheric and space weather events. Especially in Antarctica, the observation is still sparse due to a limited number of stations. In this paper, the study of ionosphere variability over Bharati station (69.41° S, 76.19° E), an Indian Antarctic research base at Larsemann Hills, was carried out. During the geomagnetically quiet conditions, the Bharati station is located outside of auroral oval but towards the poleward of auroral oval. The variation of ionosphere for diurnal, seasonal, and solar activity was studied using the TEC data for the years 2010–2022 which covers the solar cycle 24. The TEC diurnal pattern is strong even during polar days and nights with a peak at local noon. The seasonal variability was distinctly observed with about 50% increase in TEC during equinoctial months compared to summer months during high solar active year 2014. However, during low solar active year there is a marginal increase of TEC in equinoxes compared to summer.

总电子含量(TEC) 是一个关键参数，用于了解电离层对卫星导航和通信信号的影响。极地电离层高度动态，是日地能量转移过程、不同磁层和空间天气事件的主要汇。特别是在南极洲，由于观测站数量有限，观测仍然稀疏。本文对位于拉斯曼山的印度南极研究基地巴拉蒂站（南纬69.41°，东经76.19°）的电离层变化进行了研究。在地磁安静条件下，巴拉蒂站位于极光椭圆形的外部，但朝向极光椭圆形的极地。使用 2010-2022 年涵盖太阳活动周期 24 的 TEC 数据研究了电离层随昼夜、季节和太阳活动的变化。即使在极地白天和夜晚，TEC 的昼夜模式也很强，在当地中午达到峰值。明显地观察到季节性变化，与 2014 年太阳活跃年的夏季相比，春分月的 TEC 增加了约 50%。然而，在太阳活动低的年，与夏季相比，春分点的 TEC 略有增加。