ESA's CryoSat Expands Its Role to Measure Geomagnetic Storms

The European Space Agency's (ESA) CryoSat mission, primarily designed to monitor polar ice sheets and floating sea ice, has recently expanded its functionality to include the measurement of geomagnetic storms. This unexpected capability emerged following a software upgrade to its platform magnetometer at the end of 2025. Originally intended for operational purposes, the magnetometer now allows CryoSat to gather scientific data on Earth's magnetosphere with precision, complementing the data collected by ESA's dedicated Swarm mission.

ESA’s CryoSat Update Gave It Magnetic Field SuperpowersESA Adds Magnetometry Capability to Long-Running CryoSat MissionEuropean Space Agency

On January 18, 2026, a strong X-class solar flare triggered a geomagnetic storm that produced some of the most intense radiation storms recorded, leading to auroras visible at unusually low latitudes, from Europe to Mexico. Over the course of three days, CryoSat contributed high-quality data that measured the intensity of this geomagnetic storm. The data collected was validated through a new analysis method detailed in Geophysical Research Letters, showcasing the storm's impact on Earth's magnetic field.

European Space AgencyESA Adds Magnetometry Capability to Long-Running CryoSat Mission

CryoSat's new magnetometry capabilities effectively create a dual mission approach within ESA's Earth Explorer family, alongside the Swarm mission. This innovation allows for a secondary dataset to be generated from an existing system, providing valuable insights into geomagnetic phenomena without incurring additional costs. Anja Stromme, ESA’s Mission Manager for Swarm, emphasized the significance of this development, stating, “This is a great accomplishment that significantly benefits the Swarm community.”

ESA Adds Magnetometry Capability to Long-Running CryoSat MissionESA’s CryoSat Update Gave It Magnetic Field SuperpowersEuropean Space Agency

Tommaso Parrinello, ESA’s CryoSat Mission Manager, remarked on the innovation, saying, “This is about leveraging data from an existing system that has been used for the past 16 years to actively control the satellite's orientation in space.” He highlighted the precision and low noise level of the measurements, which have led the scientific community to recognize their value as scientific data. The integration of CryoSat's magnetometry data with that of the Swarm mission is expected to enhance the understanding of Earth's magnetic environment.

ESA Adds Magnetometry Capability to Long-Running CryoSat MissionESA’s CryoSat Update Gave It Magnetic Field Superpowers

While the upgrade has been praised for its innovative approach, some experts have raised concerns about the potential limitations of using a satellite not originally designed for geomagnetic research. They argue that the data quality and reliability must be continuously evaluated to ensure it meets the rigorous standards required for scientific analysis.

ESA Adds Magnetometry Capability to Long-Running CryoSat Mission

As both CryoSat and Swarm continue their missions beyond their design lifetimes, researchers anticipate further advancements in geomagnetic studies. The successful integration of CryoSat's new capabilities into ongoing scientific efforts underscores the potential for existing technologies to be repurposed for new scientific inquiries.

ESA Adds Magnetometry Capability to Long-Running CryoSat Mission

In summary, ESA's CryoSat mission has successfully transitioned from a focus solely on ice monitoring to also contributing valuable data on geomagnetic storms, marking a significant advancement in satellite technology and Earth observation capabilities.

ESA’s CryoSat Update Gave It Magnetic Field SuperpowersESA Adds Magnetometry Capability to Long-Running CryoSat Mission