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. Author manuscript; available in PMC: 2017 Mar 12.
Published in final edited form as: Nat Phys. 2016 Sep 12;12(12):1158–1163. doi: 10.1038/nphys3879

Figure 5. Theoretical predictions for THEMIS observations on 23 March 2009 around 6:21 UT.

Figure 5

phase portrait of a thin filament oscillating anharmonically around its equilibrium position at X ≈ –14RE (a) in the asymmetric potential well U (b). Force per unit magnetic flux Fx is given in the most tailward (X ≈ –16RE) and most earthward (X ≈ –13RE) positions reached by the thin filament.