Quick Read
- A G1-G2 geomagnetic storm is expected to reach Earth between March 29 and 30, 2026.
- Visibility of the northern lights is possible in 10 northern U.S. states, though moonlight may hinder viewing.
- Observers are advised to track the Bz component of the interplanetary magnetic field for the best chance of seeing aurora.
Observers in the northern United States may have a rare opportunity to view the aurora borealis between March 29 and March 30, 2026. The National Oceanic and Atmospheric Administration (NOAA) has issued a geomagnetic storm watch following a significant M3.9-class solar flare from sunspot AR4403, which resulted in a coronal mass ejection (CME) now headed toward Earth.
Geomagnetic Storm Impact and Visibility
The incoming CME is a cloud of charged particles that, upon interacting with Earth’s magnetic field, is expected to trigger G1 or G2-class geomagnetic storm conditions. According to current models, the event could generate auroral displays visible along the northern horizon for residents in states near the Canadian border, including parts of Alaska, Washington, Idaho, Montana, North Dakota, South Dakota, Minnesota, Wisconsin, Michigan, and Maine.
However, atmospheric conditions may challenge casual viewing. A 90%-lit waxing gibbous moon is currently present in the night sky, creating significant ambient light that could wash out fainter auroral colors. Experts advise that a clear, dark northern sky is essential for successful observation, even during moderate geomagnetic activity.
Tracking the Solar Interaction
The intensity of the display depends heavily on the interplanetary magnetic field’s Bz component. When the Bz component swings south—specifically at a sustained level of -5 nT or stronger—it allows solar plasma to enter the magnetosphere more efficiently, significantly increasing the likelihood of vibrant green or red light displays. Observers are encouraged to monitor live solar wind data via platforms like SpaceWeatherLive or dedicated aurora tracking applications.
For those attempting to capture the phenomenon, using a tripod to stabilize the camera and shooting in RAW format with exposures between five and ten seconds is recommended. While the human eye may struggle to distinguish faint glows against the moonlight, longer camera exposures are often capable of revealing colors that remain invisible to the unaided eye.
While the current geomagnetic storm watch provides a window for potential sightings, the combination of a high-intensity moon phase and the unpredictable nature of solar wind speeds suggests that visibility will remain localized and highly dependent on precise magnetic field alignment during the overnight hours.