NOAA Releases First Magnetometer Data, Boosts Local Storm Forecasting

NOAA National Environmental Satellite Data and Information Service posted initial magnetometer data from the Space Weather Follow On Lagrange 1 observatory on December 11, 2025. The magnetometer instrument was activated after the observatory launched on September 24, 2025, and captured the structure of coronal mass ejections that produced a severe geomagnetic storm rated G4 on November 12, 2025. The public release includes the three components of the interplanetary magnetic field, X, Y and Z, and confirms that the Z component is especially important for indicating how much solar wind energy is driving a storm. That input is a key element for operational forecasting at NOAA’s Space Weather Prediction Center.

The data are preliminary and were collected during post launch testing, but NESDIS says they are already useful for understanding storm drivers and improving forecasts. The magnetometer hardware consists of two sensors mounted on a boom to reduce spacecraft magnetic noise, a configuration intended to improve measurement fidelity as the observatory reaches its operational post. The observatory is expected to arrive at the Earth Sun L1 point and transition to full operational status in early 2026, providing continuous upstream monitoring of incoming solar wind.

For North Slope Borough the timing is significant. Local aviation, commercial and emergency services rely on satellite navigation and communications that are vulnerable during severe geomagnetic activity. Satellite operators and airlines benefited from earlier advance warnings during the November 12 event, and NESDIS highlights that those warnings reduced impacts to satellites, aviation and other systems. Improved near real time measurements at L1 enhance lead times for protective actions, flight planning and satellite operations that northern communities depend on for weather forecasts, air service and remote communications.

As the observatory moves to operational status next year, the magnetometer data will become a routine input to space weather watches and warnings. Borough emergency managers, transportation operators and infrastructure providers will have a new data stream to incorporate into resilience planning and operational decision making. NOAA will continue releasing updated measurements and forecast guidance as SWFO L1 completes commissioning and transitions to steady state operations.