Kristian Birkeland's magnetised terrella. In this experiment, he noted two spirals which he considered may be similar to that of [[spiral nebulae.

A Terrella Device for Simulating Aurora-Like Phenomena in a Box
The spinning terrella plasma experiment: Initial results
Simulation of space weather with Terrella experiment
From Peregrinus' s Spherical loadstone to Gilbert's Terrella
The Birkeland Terrella Experiments and their Importance for the Modern Synergy of Laboratory and Space Plasma Physics
Numerical simulation of phase-space flows in the Collisionless Terrella experiment
Über eine neue Deutungsmöglichkeit von Terrella-Experimenten by Horst Hänsel, Tellus , 17, pp. 194–203
Observation of wave‐induced chaotic radial transport in a laboratory terrella experiment
Wave‐induced chaotic radial transport of energetic electrons in a laboratory terrella experiment
Observation of Chaotic Particle Transport Driven by Drift-Resonant Fluctuations in the Collisionless Terrella Experiment.