Flux quanta, magnetic field lines, merging ĝ€" some sub-microscale relations of interest in space plasma physics

Abstract

We clarify the notion of magnetic field lines in plasma by referring to sub-microscale (quantum mechanical) particle dynamics. It is demonstrated that magnetic field lines in a field of strength B carry single magnetic flux quanta Φ0Combining double low line h/e. The radius of a field line in the given magnetic field B is calculated. It is shown that such field lines can merge and annihilate only over the length ℓ∥ of their strictly anti-parallel sections, for which case we estimate the power generated. The length ℓ∥ becomes a function of the inclination angle Î̧ of the two merging magnetic flux tubes (field lines). Merging is possible only in the interval 1span styleCombining double low line"margin-left:-.5em; margin-right: 1.0em; vertical-align:-15%; font-size:.7em; color: #000;">2 πθπ. This provides a sub-microscopic basis for "component reconnection" in classical macro-scale reconnection. We also find that the magnetic diffusion coefficient in plasma appears in quanta D0mCombining double low linee Φ0/meCombining double low lineh/me. This lets us conclude that the bulk perpendicular plasma resistivity is limited and cannot be less than η0⊥Combining double low lineμ0eΦ0/meCombining double low lineμ0h/me∼10-9 Ohm m. This resistance is an invariant. © 2011 Author(s).