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Solar storms can disrupt high-frequency radio, satellite systems, GPS/GNSS signals and electric-grid operations. A severe event can contribute to a household power outage, but most geomagnetic disturbances are less dramatic and are managed by grid operators. Phones, internet connections and satellites do not automatically fail whenever solar activity increases.
The sensible preparation is twofold: monitor official space-weather alerts from NOAA’s Space Weather Prediction Center (SWPC), and maintain an ordinary household plan for an extended power or connectivity outage. No consumer device has been established as a guaranteed shield against a solar storm.
What a solar storm is—and why the effects differ
“Space weather” describes radiation, energetic particles and solar-plasma eruptions that can affect technology near Earth. NOAA separates the main hazards into three categories. They can occur together, but each has a different trigger and produces different risks.
Radio blackouts from solar flares
A solar flare releases intense radiation that can rapidly change the sunlit side of Earth’s ionosphere. High-frequency (HF) radio uses the ionosphere to carry signals over long distances. NOAA SWPC defines HF as 1–30 MHz and explains that changes in ionospheric density and structure can bend, weaken or block those transmissions. Amateur-radio operators, commercial airlines and government agencies use HF links, so a flare can disrupt their communications even when local cellular service appears normal.
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Solar-radiation storms from energetic particles
Solar energetic particles can reach spacecraft and penetrate satellite electronics. They can cause malfunctions or damage, with the greatest concern for satellite operators, astronauts and some aviation routes. This hazard is measured on NOAA’s S1–S5 solar-radiation-storm scale. It is not the same mechanism as a geomagnetic storm and does not mean that every ground-based electronic device will stop working.
Geomagnetic storms from coronal mass ejections
A coronal mass ejection (CME) can carry magnetized plasma toward Earth. When it interacts with Earth’s magnetic field, it creates a geomagnetic disturbance. Rapid magnetic-field changes can induce currents in long conductors, including portions of electric-transmission networks. Geomagnetic activity can also disturb satellite operations and reduce the accuracy of GPS and other GNSS signals. NOAA labels these events G1 through G5.
| Hazard | Primary trigger | Systems most exposed | NOAA scale |
|---|---|---|---|
| Radio blackout | Solar-flare radiation changing the ionosphere | HF radio, including some aviation, amateur and government links | R1–R5 |
| Solar-radiation storm | Energetic particles from solar eruptions | Satellite electronics, spacecraft and some aviation operations | S1–S5 |
| Geomagnetic storm | CME-driven disturbance of Earth’s magnetic field | Electric-grid operations, GPS/GNSS, satellites and other long conductors | G1–G5 |
Can a solar storm knock out power or communications?
Electricity: possible, but not inevitable
Geomagnetically induced currents can interfere with grid equipment and operating procedures. In an extreme event, they can damage high-voltage transformers and create outages that take days, weeks or longer to repair. NOAA’s account of the March 1989 storm records a Quebec power outage lasting about nine hours.
That historical outage is not a prediction of how long a future outage would last. Grid operators monitor geomagnetic conditions, adjust operations and use protective procedures. NOAA notes that most geomagnetic disturbances are less dramatic than the worst historical cases. A G-scale alert is therefore a risk indicator, not a promise that every home will lose power.
Communications: the underlying system matters
A flare-related HF blackout can affect a particular frequency range or the sunlit side of Earth while leaving local wired and cellular networks available. A satellite problem can affect a service that depends on a spacecraft without disabling every satellite or terrestrial network. Grid disruption can remove power from network equipment, but that is a secondary outage pathway rather than proof that the internet itself will fail worldwide.
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Cell phones may continue to connect if local towers, backhaul links and backup power remain available. They may become unusable in a particular area if a power failure, congestion or unrelated infrastructure problem occurs. NOAA’s material describes risks to communications infrastructure, not guaranteed failure of all phones, satellites or internet services.
GPS and other navigation signals
Geomagnetic activity can alter the ionosphere and reduce GPS/GNSS accuracy. The result may be degraded positioning, timing errors or loss of a precise fix for a period of time. That does not mean every navigation app will stop, but it does mean that aviation, shipping, surveying, timing systems and other users that require high precision should not assume normal accuracy during an alert.
Which alerts to follow
NOAA’s Space Weather Prediction Center is the official U.S. source for space-weather watches, warnings and alerts. Its products communicate expected severity and possible impacts to organizations such as electric utilities, satellite operators, aviation users and emergency planners. Use SWPC’s current conditions and alerts rather than relying on a screenshot, social-media post or an old forecast.
| Alert family | What it describes | Household interpretation |
|---|---|---|
| G1–G5 geomagnetic storms | Disturbances in Earth’s magnetic field, including possible induced currents and navigation effects | Watch for possible grid or GPS impacts; severity does not guarantee a residential outage |
| S1–S5 solar-radiation storms | Energetic particles that can affect spacecraft, satellites and some aviation operations | Most direct effects are on space and aviation systems; ground impacts depend on the service involved |
| R1–R5 radio blackouts | Solar-flare effects on HF radio propagation | Expect problems mainly on affected HF paths and frequencies, not automatic failure of every radio or phone |
Earlier notice gives operators time to act. In a NOAA SOLAR-1 release, SWPC director Clinton Wallace said: “It means more time to act. It gives time for power grid operators to prepare, more time for satellite operators to protect assets, more time for aviation and national security partners to understand risk, and more time for human spaceflight teams to protect astronauts and missions.”
How to prepare before a solar-storm alert
1. Set up a reliable alert routine
- Use NOAA SWPC as your primary source for watches, warnings and current conditions.
- Enable notifications from your local emergency-management authority and electricity provider when those services are available.
- Keep at least one way to receive information that does not depend on home broadband. A mobile connection may remain available, but it should not be your only channel during a power or network outage.
- Check alerts at the start of a watch and again when a warning is issued. Space-weather severity and expected timing can change.
Do not treat an alert level as a household damage forecast. The scale describes the space-weather environment and likely technical effects; local infrastructure, grid configuration and the systems you use determine what you actually experience.
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2. Map your household’s technology dependencies
Make a short list of what requires electricity, connectivity, satellite timing or GPS. Include medical equipment, heating or cooling controls, internet equipment, security systems, payment devices, work systems and transport apps. Identify which items have internal batteries and which need mains power.
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For each critical item, record a non-network fallback. Examples include a printed telephone list, a paper map, a manual operating procedure or a local service number. These are ordinary outage-continuity measures, not solar-storm-specific protection.
3. Use your existing extended-outage plan
Follow the plan from your local emergency-management authority for prolonged power loss. Review how your household will obtain water, medicines, food, lighting and temperature control, and how family members will communicate if networks are intermittent. Keep instructions accessible on paper in case phones cannot be charged.
The official space-weather pages reviewed by NOAA explain infrastructure risks but do not publish a dedicated household solar-storm checklist. Treat the items above as general emergency planning that should be adapted to your location, medical needs and building rules, not as a NOAA prescription.
4. Keep ordinary backup power available
Charge power banks and essential-device batteries as part of your normal outage routine. A small uninterruptible power supply can provide time to shut down a computer or keep selected networking equipment running during a brief interruption. Neither device is proven to block geomagnetically induced currents or make electronics “solar-storm-proof.”
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If your plan includes a generator, follow the manufacturer’s installation and ventilation requirements and your local fire code. A generator supplies local power; it does not protect the wider grid or guarantee communications service.
5. Prepare navigation and communication fallbacks
Download information you may need while you still have connectivity, such as offline maps, addresses and transport details. Keep a paper map for essential routes. If your work or travel depends on precise GNSS timing, ask the responsible service provider what its contingency procedure is rather than assuming a consumer navigation app will provide the required accuracy.
Agree on a family meeting place and a check-in method that does not require everyone to call simultaneously. During congestion, short text messages may succeed when voice calls do not, but no single method is guaranteed.
6. Consider a battery weather radio—with realistic expectations
A battery-powered emergency weather radio can be useful for receiving some local emergency information during a conventional power outage. This is a general preparedness inference from NOAA’s alerting role, not a NOAA recommendation, a guarantee that every space-weather update will be broadcast, or a tested solar-storm countermeasure. Radio reception itself can be affected by space weather, especially on HF paths.
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What to do while an alert or disruption is active
During a geomagnetic-storm warning
- Keep essential devices charged and limit nonessential battery use.
- Check your utility’s outage channel and follow local instructions if power quality changes or service fails.
- Allow extra time for navigation and verify critical locations by another method if GPS behavior becomes inconsistent.
- Do not repeatedly restart networking equipment unless your provider or local emergency authority advises it; an apparent internet failure may be a wider power or backhaul problem.
During a radio-blackout warning
- Expect the greatest risk on HF links, particularly on the sunlit side of Earth.
- Use an alternate communication path supplied by your organization, carrier or local authority when available.
- Do not infer that a failed HF link means cellular, fiber or every satellite service has failed.
During a solar-radiation-storm warning
- Follow instructions from airlines, satellite-service providers, employers and other organizations that operate space- or aviation-dependent systems.
- Ground-based households generally face indirect effects through the services they use, rather than a universal shutdown of consumer electronics.
What consumer equipment can—and cannot—do
| Equipment or measure | Reasonable ordinary-use benefit | What is not established |
|---|---|---|
| Battery weather radio | May receive local emergency broadcasts during a mains-power outage | Guaranteed space-weather reception or immunity to radio interference |
| Power bank | Extends the life of a phone or small device when outlets are unavailable | Protection from geomagnetic currents or a guarantee of cellular service |
| UPS | Provides short-duration backup power and controlled shutdown for selected electronics | Proof that connected equipment is protected from a severe geomagnetic event |
| Surge protector | May address certain ordinary electrical surges when correctly rated and installed | A validated shield against solar-storm effects |
| Faraday cage | Can be useful for specific electromagnetic-engineering applications when properly designed | A household solution proven to protect all devices during a geomagnetic storm |
| Solar charger | Can recharge compatible devices when sunlight and equipment are available | Reliable operation during every space-weather event or protection for the grid |
Do not buy a product solely because its advertising promises “solar-storm protection.” The official material available for this topic focuses on monitoring and infrastructure operations, not consumer-product testing.
Historical events that put the risk in context
March 1989: Quebec outage
NOAA describes a geomagnetic storm that caused a Quebec power outage lasting about nine hours. It demonstrates that space weather can affect a regional grid, but it does not establish a standard outage duration for future storms.
October 2003: Wide Area Augmentation System outage
During the “Halloween Storms,” the FAA’s Wide Area Augmentation System experienced an outage lasting about 30 hours, according to NOAA. The event illustrates how navigation augmentation can be affected without implying that every GPS receiver will be unavailable.
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NOAA reports that United Airlines diverted 26 flights from polar routes to avoid radio-blackout potential. This is an aviation-operational response to a particular event, not evidence that all commercial flights must be diverted during every solar storm.
The 2013 Lloyd’s projection
NOAA’s explainer repeats a Lloyd’s of London prediction published in 2013: an extreme space-weather storm could affect 20–40 million people in the United States, produce up to $2.6 trillion in damages and require up to two years of recovery. Those figures are a modeled prediction from 2013, not observed losses, a current estimate or a forecast for a named event.
What to do if services fail
If the power goes out
- Check whether the outage is limited to your home, your building or the wider area.
- Use your utility’s outage-reporting channel if it is reachable, then follow local safety instructions.
- Operate only the backup equipment you have already tested under its safety requirements.
- Preserve battery capacity for essential communication and medical needs.
If GPS becomes inaccurate
- Stop treating the displayed position as authoritative when it conflicts with known landmarks or a paper map.
- Use another navigation source and allow additional travel time.
- For professional or safety-critical operations, follow the organization’s GNSS-contingency procedure.
If radio or satellite communication fails
- Identify whether the failure is limited to one frequency, provider or device.
- Switch to the alternate channel specified by your employer, carrier or local authority.
- Do not assume a failed HF or satellite link proves that every communications system is down.
If you cannot receive alerts
Use any functioning local emergency channel, utility notice or public-safety announcement. Once connectivity returns, check SWPC’s current conditions rather than relying on an unverified replay of an earlier warning.
How to judge the risk without panic
Strong geomagnetic storms are uncommon, while weaker disturbances occur more often and are usually handled by operators. An alert is a reason to check your ordinary outage plan and monitor updates—not evidence of an imminent “Carrington-level” catastrophe, a guaranteed nationwide blackout or universal failure of the internet and phones.
The most useful preparation is resilient, ordinary and specific: know which services your household depends on, keep more than one way to obtain information, maintain practical backup power and navigation options, and follow NOAA SWPC and local authorities when conditions change.
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