During geomagnetic quiet conditions, Indian Antarctic stations are considered to be located outside the auroral oval: Maitri (CGM coordinates: 63.3°S, 54.2°E) is equatorward and Bharati (CGM coordinates: 74.8°S, 98.4°E) is poleward of the auroral oval. Simultaneous observations of magnetic field variations at these two locations for 10-years (2013–2022) provide an opportunity to study quiet-time magnetic field patterns, if any. Geomagnetic quiet days with ΣKp ≤ 3 are selected, during which the lower values of solar wind and interplanetary parameters are also confirmed. Maitri station exhibits clear southern hemispheric solar quiet (Sq) type of magnetic field variation on geomagnetic quiet days in all seasons, indicating the influence of ionospheric dynamo due to thermospheric winds. Interestingly, Bharati station also displays regular and systematic magnetic field variations in all three components. The D-component at Bharati exhibits very strong variation at early morning hours (7–8 MLT), which is ∼2–4 times stronger than that of H-component, driving strong equatorward/northward currents during all seasons. Both stations show annual type of seasonal variation with peak amplitude during summer and least during winter. The schematic illustration of global and polar Sqs proposed here explains the results obtained through 10-years’ statistical study.

在地磁安静条件下，印度南极站被认为位于极光椭圆形之外：Maitri（CGM 坐标：63.3°S，54.2°E）位于赤道方向，Bharati（CGM 坐标：74.8°S，98.4°E）位于极地方向。极光椭圆形。对这两个地点的磁场变化进行 10 年（2013 年至 2022 年）的同时观测提供了研究安静时间磁场模式（如果有）的机会。选择ΣKp≤3的地磁安静日，同时也确认了太阳风和行星际参数的较低值。Maitri站在所有季节的地磁安静日都表现出明显的南半球太阳安静（Sq）型磁场变化，表明热层风引起的电离层发电机的影响。有趣的是，巴拉蒂站还显示所有三个组成部分的规则和系统磁场变化。巴拉蒂的 D 分量在清晨（7-8 MLT）表现出非常强烈的变化，比 H 分量强约 2-4 倍，在所有季节驱动强烈的赤道/北向洋流。两个站都显示出年度类型的季节变化，夏季幅度最大，冬季幅度最小。这里提出的全球和极地Sqs的示意图解释了通过10年的统计研究获得的结果。