Thank you for sharing your theory. I always thought that magnetic fields were under rated. They should be considered to explain the shape of bar spiral galaxies. I suggested same to my astronomy professor back in 1979 and he poo-pooed the idea.
Your observation that the shape of galaxies can be explained by plasma dynamics is correct, and not only for spiral bars, but for every observed regular configuration of galaxies. As an example, here is a "top down" view of two interacting Birkeland currents (currents traveling on plasma filaments), showing how the dynamics of their interaction can form a galactic shape:
Your astronomy professor who poo-poohed the idea doesn't understand physics and was totally unaware that electromagnetic phenomena, while being just as infinite in reach as gravity, are 39 orders of magnitude (1039 or 100,000,000,000,000,000,000,000,000,000,000,000,000,000 STRONGER than gravity.
What even these modern orthodox gravity cosmologists don't even attempt to try to explain is how gravity can explain the twisted thread of plasma extending over one million light years away from the gravity source and still remain tightly coherently, twisted and contained! The twisting they explain by using a water sprinkler analogy... but ignore inertia of a body in motion tending to stay in motion in the vector it has received by the impetus it was given. They have NO explanation beyond that as to what keeps these double helix formations together. Electric Universe Cosmologists not only can explain them, they can REPRODUCE them in the microcosm in the laboratory in plasmas with electromagnetic forces and in computers using electromagnetic formulae. Even every shape of every galaxy can be derived from those formulae without resorting to the Orthodox Cosmologists' waving of hands and invocations of the magic of dark matter, dark energy, and their magic Neutron stars and black holes to get their theories to work.
The ONLY thing that could do that would be a large current of electric energy flowing through the plasma, sustaining a huge rotating magnetic field, containing plasma. Trillions of volts flowing through threads of plasma conduits through an anything but empty universe. An electric universe in which stars are anodes, Enormous power transistors, along currents fed by those energy conduits, and not nuclear engines driven by gravitic fusion.
This alone explains why the surface our star is only 5000 K while the upper atmosphere is in the 5,000,000 K, something that CANNOT be explained by any form of "convection" as the current orthodox solar and gravitic cosmologist try to explain it, but which electric cosmologist can easily explain and demonstrate using electronic gate technology.
It is amazing to watch as article after article is released from the astronomy and cosmology community that starts with something like "Astronomers and Cosmologists were (surprised, astounded, shocked - choose one) to find. . .), when what they found was something that was predicted, expected, and already being looked for by the proponents of the Electric Universe Theories of Harlan Arp, Walt Thronhill, and Nobel Prize winning cosmologist Hannes Alfven
Check out Thunderbolts.info for lots more scientific and scholarly info on the Electric Universe. I have pinged the Electric Universe ping list as well to this thread.