Agnes MaxwellTwo coronal mass ejections from the sun are producing a G2 geomagnetic storm this week, bringing rare northern lights displays to more than 18 US states — and raising important questions about solar activity's effects on human health and technology systems.
What Is Causing the Northern Lights This Week?
An M2.8 solar flare erupted from active region AR4392 on 16 March 2026, followed by a second coronal mass ejection (CME) launched by a filament eruption at 3 UTC on 17 March. NOAA's Space Weather Prediction Center issued an official G2 (moderate) geomagnetic storm watch for 19 March 2026, with the possibility of escalating to G3 (strong) levels.
The timing is no coincidence. The aurora display coincides almost exactly with the spring equinox on 20 March 2026 — a date when Earth's magnetic field orientation is most susceptible to solar wind coupling, creating what scientists call "aurora season." Geomagnetic storms during equinox periods are statistically more likely to produce low-latitude aurora visible across broad swaths of the continental US.
States in the primary viewing zone include Alaska, Washington, Oregon, Idaho, Montana, Wyoming, North and South Dakota, Nebraska, Minnesota, Iowa, Wisconsin, Michigan, Illinois, New York, Vermont, New Hampshire and Maine. Optimal viewing windows run from approximately 10 p.m. to 4 a.m. local time, with peak activity typically between midnight and 2 a.m.
Solar Storm Health Effects: What You Need to Know
The spectacular light show comes with a less-discussed dimension: geomagnetic storms have measurable effects on human biology and technology systems that are worth understanding.
Effects on the human body: The geomagnetic disruptions associated with G2-level storms are generally considered safe for most people. However, research published in journals including the British Journal of Psychiatry and Biological Psychiatry suggests that geomagnetic storm activity correlates with subtle increases in reported headaches, sleep disturbances, and mood fluctuations in sensitive individuals. People with certain cardiac conditions, particularly those with implanted pacemakers or defibrillators, should be aware that strong geomagnetic storms can in rare cases affect device function — though G2-level events pose minimal risk compared to G4 or G5 storms.
For those with anxiety disorders, the disorienting visual phenomenon of aurora at unusual latitudes — if encountered unexpectedly — can occasionally trigger anxiety responses. If you or someone you know has been experiencing unexplained sleep disruption, headaches or mood changes during geomagnetically active periods, a conversation with a healthcare provider can help rule out underlying causes.
UV and eye safety: A common misconception is that aurora viewing requires staring into a bright light source. The aurora borealis does not emit UV radiation and is safe to watch directly with the naked eye. However, safe practices for photographing the aurora — especially with prolonged sessions in cold outdoor conditions — include protecting against hypothermia and frostbite during late-night viewing sessions.
Technology Disruption: When Solar Storms Affect Daily Life
The G2 storm has broader technology implications beyond the visual spectacle.
GPS signal degradation is the most immediately practical concern. Geomagnetic storms cause ionospheric instabilities that scatter GPS signals as they pass through disturbed layers of the upper atmosphere. During G2 events, GPS accuracy can degrade by several meters — a minor inconvenience for most users but a meaningful issue for professionals relying on precision navigation: construction surveyors, agricultural machinery operators, maritime pilots and aviation professionals.
High-frequency (HF) radio communications — used by amateur radio operators, maritime vessels and some emergency services — can experience partial or complete blackouts on sun-facing sides of the Earth during the peak of geomagnetic activity. Emergency operations centres typically have contingency protocols for solar events, but smaller businesses using HF radio should be aware of potential disruption.
Power grid operators across the US have been monitoring this event closely. G2 storms can induce geomagnetically induced currents (GICs) in long-distance power transmission lines, causing transformer heating and voltage instability in high-latitude regions. While a G2 event is unlikely to cause widespread outages, utilities in northern states have precautionary protocols in place.
For businesses running IT infrastructure, the practical risk from a G2 storm is low — modern data centres are well-shielded against geomagnetic effects. However, this week's event is a timely reminder that space weather is a real operational risk category. IT managers at organisations with critical infrastructure should have space weather alerts integrated into their monitoring systems.
Should You See a Doctor About Solar Storm Sensitivity?
For most Americans, this week's aurora is simply a breathtaking natural spectacle. However, a subset of the population — estimated in some studies at 10–15% — reports noticeable physical or psychological symptoms during periods of elevated geomagnetic activity. These include migraine onset, disrupted sleep architecture (particularly REM sleep reduction), and mood dysregulation.
If you consistently notice changes in your wellbeing that correlate with geomagnetic events, this is worth discussing with a physician. A health specialist on Expert Zoom can help you assess whether your symptoms have physiological roots — and rule out other causes like seasonal changes, stress, or underlying conditions that might be mimicking storm-related sensitivity.
The science of space weather's effects on human biology is still developing. But the convergence of a G2 storm, a spring equinox and widespread northern lights visibility makes this an ideal moment to pay attention to how your body responds — and to seek professional guidance if you have concerns.
Medical disclaimer: Information in this article is for educational purposes only. Consult a qualified healthcare provider for personal medical advice. People with implanted cardiac devices should contact their cardiologist with any concerns about electromagnetic interference.
