Electrojet Zeeman Imaging Explorer

Electrojet Zeeman Imaging Explorer (EZIE) is a NASA heliophysics mission, that studies the Sun and space weather near Earth. It consists of three CubeSats that observe the auroral electrojets, by exploring a phenomenon called Zeeman splitting – the splitting of a molecule’s light spectrum near a magnetic field.^[1] EZIE was launched on 14 March 2025 on SpaceX Transporter-13 Mission as a rideshare payload.^[2]

Electrojet Zeeman Imaging Explorer

Artist's concept of the EZIE satellites
Names	EZIE
Mission type	Magnetospheric research
Operator	NASA
Website	https://ezie.jhuapl.edu
Mission duration	18 months (planned)
Spacecraft properties
Manufacturer	Blue Canyon Technologies
Start of mission
Launch date	14 March 2025
Rocket	Falcon 9 Block 5
Contractor	SpaceX
Orbital parameters
Reference system	Geocentric orbit
Regime	Sun-synchronous, low Earth orbit

EZIE satellites captured "first light" on March 19; one of the three satellites successfully recorded Zeeman splitting of the 118 GHz oxygen emission line for the first time with its Microwave Electrojet Magnetogram (MEM) instrument.^[3]

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Further reading

• Padmanabhan, Sharmila; Misra, Sidharth; Kangaslahti, Pekka; Montes, Oliver; Bosch-Luis, Javier; Cofield, Rick; Ramos, Isaac; Yee, Sam (17 July 2022). Microwave Electrojet Magnetogram (MEM) Instrument for the Electrojet Zeeman Imaging Explorer (EZIE) Mission. IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium. pp. 7337–7340. doi:10.1109/IGARSS46834.2022.9884004.