Figure 13-70Focusing Jets by Magnetic Fields The hot, ionized accretion disk spirals around the central black hole. This motion creates a magnetic field that is twisted into spring-shaped spirals on both sides of the disk. Some of the accretion disk’s gas falling toward the black hole is overheated and squirted at high speeds into the two tubes created by the magnetic fields. The fields keep the gas traveling directly outward from above and below the disk, thus creating the two jets.