Editing Terrella (section)

==Other terrellas==
The German Baron [[Carl Reichenbach]] (1788–1869) also experimented with a terrella. He used an electromagnet, placed within a large hollow iron sphere, and this was examined in the darkroom under varying degrees of electrification.

Brunberg and Dattner in [[Sweden]], around 1950, used a terrella to simulate trajectories of particles in the Earth's field. Podgorny in the [[Soviet Union]], around 1972, built terrellas at which a flow of [[Plasma (physics)|plasma]] was directed, simulating the solar wind. Hafiz-Ur Rahman at the [[University of California, Riverside]] conducted more realistic experiments around 1990. All such experiments are difficult to interpret, and are never able to scale all the parameters needed to properly simulate the Earth's magnetosphere, which is why such experiments have now been completely replaced by [[computer simulation]]s.

Recently the terrella experiments have been further developed by a team of physicists at the Institute of Planetology and Astrophysics in Grenoble, France to create the "planeterrella" which uses two magnetised spheres which can be manipulated to recreate several different auroral phenomena.<ref>{{Cite web|url=http://planeterrella.osug.fr/?lang=en|title = Planeteterrella - English}}</ref>