Ball lightning as a force-free magnetic knot

Details Ball lightning as a force-free magnetic knot Ball lightning as a force-free magnetic knot

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phrve..62.7181r&link_type=abstract

Physical Review E (Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics), Volume 62, Issue 5, November 200

Physics

8

Arcs, Sparks, Lightning, Atmospheric Electricity

Scientific paper

The stability of fireballs in a recent model of ball lightning is studied. It is shown that the balls shine while relaxing in an almost quiescent expansion, and that three effects contribute to their stability: (i) the formation in each one during a process of Taylor relaxation of a force-free magnetic field, a concept introduced in 1954 in order to explain the existence of large magnetic fields and currents in stable configurations of astrophysical plasmas; (ii) the so called Alfven conditions in magnetohydrodynamics; and (iii) the approximate conservation of the helicity integral. The force-free fields that appear are termed ``knots'' because their magnetic lines are closed and linked.

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