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Fig. 7

image

North–south (N–S) asymmetry of FISXR during solar cycles 21, 22, and 23. The asymmetry has been represented by absolute asymmetry index (panel a)) as well as normalized asymmetry index (panel b)). The FISXR is averaged over 13 Carrington rotations for the asymmetry analysis. Vertical dashed lines indicate solar activity minima. The statistical significance of N–S asymmetry is assessed by Student’s t-test and the results are marked by circle/asterisk symbols in top panel. Here asterisks and circles represent N–S asymmetry with significance levels of 95% and 80–95%, respectively.

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