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Fig. 7

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Time-of-year (F) – UT plots based on the dependencies on ϕ shown in Figure 6 for IMF B z = −6 nT and solar wind dynamic pressure, p SW = 1.5 nT. For comparison (a) shows the Russell-McPherron pattern of IMF orientation factor sin4(θ/2) for unit IMF in the +Y or the −Y direction of the GSEQ frame (where θ is the IMF clock angle in the GSM frame). (b) shows the F-UT pattern of the dipole tile angle ϕ. (c) The peak northern hemisphere lobe field along the hinge angle bisector, B N. (d) The peak southern hemisphere lobe field along the hinge angle bisector, B S. (e) The peak magnetic shear across the current sheet at the hinge point, ΔB = B N + B S. (f) The fractional rise ΔTL in total energy stored in the tail (between X GSE = −50 R E and X GSE = −5 R E) compared to for IMF B z = 0.

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