SIMBAD references

It is pointed out that ``an indeterminacy" claimed to exist in the pulsar equation (Sulkanen & Lovelace, 1990ApJ...350..732S) or a ``free" function B_t{piomega}=β (Appl & Camenzind 1993A&A...270...71A, 1993A&A...274..699A) can be uniquely related to the stream function at the boundary of the force-free region to the load region at infinity (Michel, 1973ApJ...180L.133M: Okamoto, 1974MNRAS.167..457O). The form of β is given by β=-(α/c)(B_p{piomega}²)_∞ from the plasma conditions at infinity, where α is the angular velocity of field lines. This relation can be interpreted as indicating Ohm's law for the return current from the equatorial region to the polar region on the `sphere at infinity' with finite resistivity R<sub>L</sub>=4π/c=377Ohm, thereby ensuring the current closure. The field structure tends to be asymptotically conical, toward the `sphere at infinity' and fields fill all the space there. It is argued that force-free models for purely cylindrical jets cannot self-consistently conserve electric current. The role of the plasma conditions in the black hole equation is mentioned as well.