I recently learned about (and am now fascinated by) spheromaks. I am no expert on plasma physics, but as I understand they are analogous to propagating toroidal vortices (smoke rings), but with plasma instead of air! Because we are talking about plasma physics, they are not very stable. They propagate for a small time, but they loose energy through thermal radiation until they become unstable.
My question is the following: Would it be possible to have a spheromak propagating through empty space over large distances? Imagine that it is big and hot enough for fusion reactions to take place while it propagate. Could this balance the energy loss by radiation and stabilise it over 'human' time scales?
I know that we are not able to produce such plasma configurations. My question is not about our current technological abilities. However, I would very much like to see this as a plot element in some science-fiction story. Could it be possible to either make (in the distant future) a propagating spheromak or observe one passing by earth?