Jupiter is hiding a massive sheet of electrical current in its magnetic tail where scientists thought there was only empty space.
April 29, 2026
Original Paper
Revealing a Systematic High-latitude Current Sheet at Jupiter
arXiv · 2604.25253
The Takeaway
Data from the Juno spacecraft reveals a persistent current-sheet structure at the high latitudes of the gas giant's nightside. Standard models of planetary magnetism assumed these regions were dominated by open field lines that do not support such structures. This proves that Jupiter's magnetic tail behaves more like a complex, rotating machine than the simple tail of Earth. The discovery forces a complete rewrite of how we understand the magnetospheres of rapidly rotating planets across the galaxy. It shows that the rules we learned from Earth's magnetic field do not always apply to the biggest worlds in our solar system.
From the abstract
Based on models derived from Earth's magnetotail, other planets with dipole magnetic fields, including Mercury, Jupiter, and Saturn, were expected to possess similar magnetotail configurations. In this traditional picture, the majority of plasma is confined near the magnetic equator within a plasma sheet (or plasma disc), whereas higher-latitude regions feature strong magnetic fields that are open to the solar wind, forming magnetospheric lobes. However, auroral observations and recent simulatio