Geophysical Research Letters
Measurement of the in-plane Lorentz force and the out-of-plane magnetic field associated with the Hall electric field near the reconnection zone in the Swarthmore Spheromak Experiment (SSX) confirms expectations, based on simulation, theory and spacecraft data, that the quadrupolar out-of-plane magnetic field is a signature of collisionless effects in magnetic reconnection with a weak guide field.
W. H. Matthaeus et al.
"Fluid And Kinetic Structure Of Magnetic Merging In The Swarthmore Spheromak Experiment".
Geophysical Research Letters.