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Table 1 Summary of Sq days and the resulting median latitudes with respect to seasons and region

From: Does the South Atlantic Anomaly influence the ionospheric Sq current system? Inferences from analysis of ground-based magnetic data

 

SAA

AUS

Dataset 1 (1990)

NS (16)

−27± 5.9 (34 ± 5.7)

−25±5.9 (33 ± 5.7)

EQ (7)

−35± 5.7 (33 ± 3.7)

−25±5.7 (29 ± 3.7)

SS (16)

−40± 5.1 (31 ± 2.9)

−29±5.1 (31 ± 2.9)

Dataset 2 (2011)

NS (25)

−30± 5.8 (36 ± 3.4)

−25± 5.8 (31 ± 3.4)

EQ (71)

−36± 6.6 (35 ± 5.4)

−26± 6.6 (30 ± 5.4)

SS (23)

−41± 5.2 (30 ± 4.5)

−27± 5.2 (31 ± 4.5)

  1. The days for the two datasets are grouped into three sub-categories: NS stands for northern summer days, SS for southern summer days and EQ for the equinoctial transition days. The number in brackets behind the season represents the number of truly quiet days in the sub category. We computed the latitudes over two longitudinal sectors for the northern and southern hemisphere. The sector SAA stands for -15 ° longitude and AUS for the Australian sector at 135 ° longitude. The numbers represent the seasonal median ± the maximum standard deviation of the day-to-day tracks in the respective sub-category. Figures without brackets stand for the southern hemisphere tracks, figures with brackets and italicized stand for the northern hemisphere tracks. We observe a significant scatter of over 10 ° in the SAA for the southern hemisphere tracks.