WHAT? You managed to create a spher(et)ical magfield?
As Spartan said,
Guys... Solar Winds... heeeloo?
But more formally, the solar wind distorts the magnetic field to form that ovoid shape. I haven't managed to create a spher(et)ical field yet, it only seems to work when a star is in the sim, but then it isn't spher(et)ical...