Open Access
Research Article

Fig. 6

image

Download original image

(Top panels) The maximum lobe field along the bisector of the tail hinge angle, evaluated assuming ω = B 2/2μ o and shown as a function of the dipole tilt angle ϕ and for various values of the IMF B z. (a) shows the field in the northern lobe, B N, (b) shows that in the southern lobe, B S, both as a ratio of their values for ϕ = 0. The fall in B N with increasing ϕ is mirrored by a rise in B S, but not quite exactly: this can be seen in part (c) that shows the magnetic shear across the hinge in the current sheet ΔB = |B N| + |B S| which is proportional to the current per unit length in the cross-tail current sheet (again plotted values are normalized to the value for ϕ = 0, [ΔB] ϕ=0. It can be see that ΔB is largest for ϕ = 0 but is also larger for large positive ϕ than large negative ϕ. This is another consequence of the hemispheric asymmetry in the magnetopause model. Part (d) looks at the dependence on ϕ of the difference between the results for IMF B z = −6 nT and B z = 0 of: the total volume of the tail between X GSE = −50 R E and X GSE = 0, V TL; the rise in total stored energy compared to IMF B z = 0 case, δW TL (which is the integral of δω over the volume V TL); and the fractional rise in total energy compared to the B z = 0 case, ΔTL = δW TL/[W TL]Bz=0. Each is again plotted normalized to its value for ϕ = 0 to allow comparisons of the effects of ϕ which in each case shows the same general form as the variation of the magnetic shear, with largest values for ϕ = 0, but slightly larger values for large positive ϕ than for correspondingly large negative ϕ.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.