Birkeland currents in Jupiter’s magnetosphere observed by the polar-orbiting Juno spacecraft

A Publisher Correction to this article was published on 14 October 2019

This article has been updated


The exchange of energy and momentum between the Earth’s upper atmosphere and ionosphere, and its space environment (magnetosphere) is regulated by electric currents (called Birkeland currents) flowing along magnetic field lines that connect these two regions of space1. The associated electric currents flow towards and away from each pole primarily in two concentric conical sheets2. It has been expected that powerful sheets of magnetic-field-aligned electric currents would be found in association with the bright Jovian auroras3. The Juno spacecraft is well positioned to explore Jupiter’s polar magnetosphere and sample Birkeland or field-aligned currents and particle distributions. Since July 2016, Juno has maintained a near-polar orbit, passing over both polar regions every 53 days. From this vantage point, Juno’s complement of science instruments gathers in situ observations of magnetospheric particles and fields while its remote-sensing infrared and ultraviolet spectrographs and imagers map auroral emissions4. Here we present an extensive analysis of magnetic field perturbations measured during Juno’s transits of Jupiter’s polar regions, and thereby demonstrate Birkeland currents associated with Jupiter’s auroral emissions. We characterize the magnitude and spatial extent of the currents and we find that they are weaker than anticipated and filamentary in nature. A significant asymmetry is observed between the field perturbations and the current associated with the northern and the southern auroras.

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Fig. 1: Magnetic field perturbations associated with Jupiter’s aurora.
Fig. 2: Models of Birkeland currents.
Fig. 3: Magnetic field perturbations and electron observations.
Fig. 4: Birkeland current system and current intensities.

Data availability

The Juno magnetometer data used in this study will be made available through the NASA Planetary Data System ( in accordance with NASA policy.

Change history

  • 14 October 2019

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.


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S.K. thanks F. Bagenal for the motivation and valuable scientific discussions in relation to this paper. All authors acknowledge support from the Juno project. E.J.B. was supported by STFC grant ST/N000749/1 and a Royal Society Wolfson Research Merit Award.

Author information




S.K. wrote the manuscript and performed the magnetic field data analysis. J.E.P.C. contributed to the discussions of the data analysis and assisted with the writing of the manuscript. G.C. and F.A. performed the data analysis of the JEDI and JADE instruments and contributed to Fig. 3 of the manuscript. G.R.G. performed the data analysis of the UVS instrument and contributed to Fig. 1 of the manuscript. W.S.K. performed the data analysis of the Waves instrument and contributed to Supplementary Fig. 2 of the manuscript. D.J.G. contributed to the magnetic field data calibration and the discussions of the data analysis. B.H.M., T.K.G and Y.M.M. contributed to the discussions of the data analysis. J.S. and E.J.B. contributed to the discussions of the physics of the Birkeland currents and the data analysis. S.J.B. is the principal investigator of the mission and S.M.L. is the project scientist of the mission.

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Correspondence to Stavros Kotsiaros.

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Supplementary Information

Supplementary Figs. 1–3 and Supplementary reference 1.

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Kotsiaros, S., Connerney, J.E.P., Clark, G. et al. Birkeland currents in Jupiter’s magnetosphere observed by the polar-orbiting Juno spacecraft. Nat Astron 3, 904–909 (2019).

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