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Caption: Figure 15.
The functional form of ﹩{B}_{x}^{\gt }(x)﹩ in nondimensional units. Equation (A9) is nondimensionalized by choosing ﹩\bar{x}=x/R﹩ and ﹩{\bar{B}}_{x}^{\gt }={B}_{x}^{\gt }/{B}_{0}﹩, where B0 = μ0I/2R. The points at ﹩| \bar{x}| =\sqrt{{\pi }^{2}/4-1}﹩ indicate where the field ﹩{\bar{B}}_{x}^{\gt }﹩ becomes negative.
© 2026. The Author(s). Published by the American Astronomical Society.