Key Milestone for NASA’s EZIE Mission To Study Electrical Currents in Earth’s Upper Atmosphere


This illustration shows the three CubeSats of NASA’s EZIE mission flying in formation above Earth. The spacecraft will study electrical currents in Earth’s atmosphere that link changes in the magnetosphere to effects at the Earth’s surface during geomagnetic storms – the same storms that trigger the colorful auroral displays. Credit: NASA/Johns Hopkins APL

EZIE will fly three identical CubeSats that will orbit the globe in a pearls-on-a-string formation when it launches, which will be no earlier than September 2024. Each spacecraft will measure the electrojet current by imaging its “fingerprint.” The spacecraft will look at light being emitted from oxygen molecules below the electrojets at just 50 miles (80 kilometers) above the surface. The spacecraft will do this by exploring a phenomenon called Zeeman splitting, which is the splitting of a molecule’s light spectrum when placed near a magnetic field. Doing this means they can derive the magnetic field created by the electrojets as they flow and, in turn, detect the electrojets’ current. This new application of the Zeeman effect will allow scientists to infer the magnetic field produced by an electrojet current in the overlying ionosphere and, in turn, learn how the size and strength of these electrojets change when solar storms impact the magnetosphere.

Funding for EZIE comes from the Heliophysics Explorers Program, managed by the Explorers Program Office at NASA’s Goddard Space Flight Center in Greenbelt, Maryland. The principal investigator for the mission is Jeng-Hwa (Sam) Yee of the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland. NASA’s Jet Propulsion Laboratory will build the satellite instruments. Blue Canyon Technologies will provide the spacecraft and mission operations center, and it will perform systems integration and testing as well as mission operations. Maverick Space Systems will provide launch and deployment operations.

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