Myths vs. realities: Space weather & geomagnetic risk — what the evidence actually supports

The May 2024 geomagnetic storm, the most intense in more than two decades, caused GPS positioning errors exceeding 10 meters across the Asia-Pacific region, disrupted high-frequency radio communications for 48 hours, and triggered geomagnetically induced currents (GICs) that tripped protective relays on power transformers in southern Australia and New Zealand (NOAA Space Weather Prediction Center, 2024). With Solar Cycle 25 approaching its projected maximum in late 2025 to mid-2026, space weather risk has moved from a niche concern for satellite operators to a boardroom-level issue for energy utilities, airlines, telecommunications providers, and financial institutions across the region. Yet the conversation around space weather risk is riddled with exaggeration and misunderstanding. Sorting credible threats from overblown scenarios is essential for executives allocating resilience budgets.

Why It Matters

Space weather, driven primarily by solar flares, coronal mass ejections (CMEs), and solar energetic particle events, poses tangible risks to infrastructure systems that underpin modern economies. The Lloyd's of London and Atmospheric and Environmental Research (AER) joint study estimated that an extreme geomagnetic storm could cause $0.6 to $2.6 trillion in economic damage globally, with power grid disruptions lasting weeks to months in worst-case scenarios (Lloyd's, 2023). In the Asia-Pacific region, where rapid electrification, satellite-dependent navigation, and high-voltage direct current (HVDC) transmission lines are expanding quickly, the exposure profile is changing faster than most risk models account for.

Japan alone operates more than 1,200 satellites and depends on GPS-based precision agriculture, autonomous shipping navigation in the Seto Inland Sea, and satellite-timing for financial transaction settlement. Australia's mining sector relies on centimeter-accurate GPS for autonomous haul trucks across remote operations. India's power grid, one of the largest synchronous grids globally, uses long-distance HVDC links that are particularly susceptible to GIC effects. Understanding which risks are real, which are overstated, and which are genuinely catastrophic but low-probability is critical for proportionate investment in resilience.

Key Concepts

Space weather encompasses the variable conditions on the Sun and in the solar wind, magnetosphere, ionosphere, and thermosphere that can affect space-borne and ground-based technological systems. The primary hazard mechanisms include geomagnetically induced currents (GICs) that flow through grounded conductors such as power transformers, pipelines, and undersea cables; ionospheric disturbances that degrade or deny GPS and satellite communication signals; radiation exposure to spacecraft electronics and high-altitude aviation; and radio blackouts caused by solar flare X-ray emissions.

The Dst index (Disturbance Storm Time) measures the intensity of geomagnetic storms, with values below -250 nT classified as extreme storms. The May 2024 storm reached -412 nT, while the 1989 Quebec event that collapsed Hydro-Quebec's grid reached -589 nT. The Carrington Event of 1859, the benchmark extreme scenario, is estimated at -850 to -1,050 nT.

Myth 1: A Carrington-Class Event Would Destroy Modern Civilization

The most persistent myth in space weather discourse is that a repeat of the 1859 Carrington Event would collapse global power grids for months or years, effectively ending modern civilization as we know it. This narrative, amplified by media coverage and some advocacy organizations, vastly oversimplifies the engineering realities. The 1989 Quebec blackout, caused by a storm far less intense than the Carrington Event, lasted 9 hours, not months. The grid was restored because modern power systems include automatic protective relays, transformer monitoring systems, and operational procedures for load shedding during geomagnetic disturbances.

The reality is more nuanced. A 2024 assessment by the Electric Power Research Institute (EPRI) found that approximately 5 to 15% of high-voltage transformers in mid-to-high latitude grids could experience thermal damage from GICs during an extreme event, potentially causing regional outages lasting days to weeks rather than months (EPRI, 2024). In the Asia-Pacific context, the risk is geographically concentrated: Australia, New Zealand, and northern Japan face higher GIC exposure due to their geomagnetic latitude, while equatorial regions including Indonesia, Malaysia, and the Philippines experience substantially lower GIC levels. The Australian Energy Market Operator (AEMO) has modeled worst-case GIC scenarios and concluded that targeted hardening of 30 to 50 critical transformers would reduce extreme-event outage duration from weeks to days (AEMO, 2025).

Myth 2: GPS Will Be Completely Unusable During Major Solar Storms

Claims that GPS signals become entirely unavailable during geomagnetic storms are exaggerated but contain a kernel of truth. During the May 2024 storm, dual-frequency GPS receivers experienced positioning errors of 5 to 15 meters rather than the normal 1 to 3 meters, while single-frequency receivers saw degradation to 20 to 50 meters. Critically, GPS signals were not lost entirely. The Australian Space Agency's post-event analysis found that GPS availability remained above 85% throughout the event for dual-frequency users, though precision agriculture and autonomous vehicle operations requiring centimeter-level accuracy were effectively disrupted for 36 to 72 hours (Australian Space Agency, 2024).

The more accurate concern is degraded precision rather than total loss. Multi-constellation receivers (GPS plus GLONASS, Galileo, and BeiDou) demonstrated significantly better resilience during the May 2024 event, with positioning errors 40 to 60% lower than single-constellation GPS-only receivers. Japan's Quasi-Zenith Satellite System (QZSS), designed to augment GPS over Asia-Pacific, maintained its correction signal throughout the event, reducing positioning errors for equipped receivers to 3 to 5 meters even during peak storm conditions (Japan Aerospace Exploration Agency, 2024). The practical implication: investing in multi-constellation, dual-frequency receivers and regional augmentation systems substantially mitigates storm-related GPS risk.

Myth 3: Space Weather Forecasting Is Too Unreliable to Be Actionable

Skeptics often dismiss space weather forecasting as too imprecise to support operational decision-making. This was arguably true a decade ago but understates the significant improvements in forecasting capability. NOAA's Space Weather Prediction Center now provides 1 to 3 day advance warning of CME arrivals with approximately 80% accuracy on timing (within a 6-hour window) and 60 to 70% accuracy on storm intensity classification (NOAA SWPC, 2025). The UK Met Office's Space Weather Operations Centre has achieved similar performance, and the Bureau of Meteorology in Australia launched a dedicated space weather service in 2024.

The limitation is in the final-hour precision. The most accurate intensity forecast comes from the DSCOVR and ACE satellites positioned at the L1 Lagrange point, which provide only 15 to 60 minutes of lead time before a CME reaches Earth. For power grid operators, this is sufficient to implement protective measures such as reducing reactive power flow, disconnecting vulnerable transformers, and activating backup systems. For aviation, 1 to 3 day forecasts enable rerouting of polar flights to lower-latitude paths, a practice that airlines including Qantas, Singapore Airlines, and Japan Airlines already follow based on space weather advisories from the International Civil Aviation Organization (ICAO, 2025).

Myth 4: Only High-Latitude Countries Need to Worry

The assumption that space weather risk is exclusively a high-latitude problem ignores several important vulnerability pathways in equatorial and mid-latitude Asia-Pacific countries. While GICs are indeed strongest at high geomagnetic latitudes, ionospheric scintillation, the rapid fluctuation of satellite signals passing through disturbed ionosphere, is actually more severe in equatorial regions. The equatorial ionospheric anomaly, a band of enhanced electron density roughly 15 degrees north and south of the geomagnetic equator, generates severe scintillation during even moderate geomagnetic storms.

A 2025 study by the Indian Space Research Organisation (ISRO) documented GPS scintillation events over India during the May 2024 storm that caused signal loss-of-lock for single-frequency receivers at rates 3 to 5 times higher than observed at higher latitudes in Japan (ISRO, 2025). Indonesia, Thailand, Vietnam, and the Philippines fall within this equatorial scintillation zone. For these countries, the primary space weather risk is not power grid damage from GICs but degradation of satellite navigation and communication services that support aviation, maritime operations, and increasingly, precision agriculture and autonomous systems.

What's Working

Transformer monitoring and protection programs in Australia and Japan represent the most mature operational responses. AEMO's GIC monitoring network, deployed across 85 high-voltage substations since 2023, provides real-time GIC measurements that enable operators to implement protective switching within minutes of detecting anomalous currents. TransGrid in New South Wales has installed neutral blocking devices on 12 transformers identified as highest-risk, reducing GIC flow through those units by more than 90% (TransGrid, 2025).

Multi-constellation GNSS adoption is accelerating across the region. South Korea's mandate that all new maritime vessels use multi-constellation receivers took effect in 2025, and Australia's mining sector has shifted almost entirely to GPS plus BeiDou dual-constellation systems for autonomous vehicle operations, providing measurable resilience during the 2024 storm events.

Space weather insurance products are emerging. Lloyd's of London syndicates began offering parametric space weather coverage in 2024, with payouts triggered by Dst index thresholds. Several Australian and Japanese energy utilities have purchased these products as part of broader resilience strategies.

What's Not Working

Undersea cable vulnerability remains poorly understood. The Asia-Pacific region depends on approximately 300 submarine fiber-optic cables carrying more than 95% of inter-continental data traffic. A 2024 study published in Science found that long-haul submarine cable repeaters are susceptible to GIC-induced power supply disruptions during extreme geomagnetic storms, but the cable industry has conducted minimal empirical testing (Sangeetha Abdu Jyothi, 2024). No cable operator in the region has publicly disclosed a GIC mitigation plan for extreme space weather events.

Coordination across national boundaries is fragmented. Space weather does not respect borders, but national response plans vary dramatically in maturity. Japan and Australia have well-developed space weather response frameworks. India's is emerging. Most Southeast Asian nations lack dedicated space weather monitoring capability entirely, relying on NOAA or JAXA advisories with no national adaptation layer.

Small and medium enterprise preparedness is effectively zero. While large utilities and airlines have integrated space weather into operational planning, the vast majority of businesses dependent on GPS, satellite communications, and grid power have no awareness of or preparation for space weather disruptions.

Key Players

Established: NOAA Space Weather Prediction Center (primary global forecast provider), Japan Aerospace Exploration Agency (QZSS augmentation and space weather monitoring), Australian Bureau of Meteorology (regional space weather services), UK Met Office Space Weather Operations Centre (forecast and advisory services), Mitsubishi Electric (GIC-hardened transformer technology), ISRO (equatorial ionospheric monitoring)

Startups: Heliolytics (solar monitoring and space weather analytics for grid operators), SolarFlare AI (machine learning-based CME arrival time prediction), SpaceWx (commercial space weather data feeds for aviation and maritime), Atmospheric AI (ionospheric scintillation forecasting for GNSS users)

Investors: European Space Agency (space weather mission funding), NASA Heliophysics Division (research and monitoring satellite programs), Asian Development Bank (resilience infrastructure financing including space weather preparedness)

Action Checklist

• Assess organizational dependency on GPS, satellite communications, and grid power to identify space weather exposure points
• Upgrade critical GNSS systems to multi-constellation, dual-frequency receivers with regional augmentation service subscriptions
• Request GIC vulnerability assessments from power grid operators for facilities in geomagnetic latitudes above 30 degrees
• Subscribe to space weather alert services from NOAA SWPC or regional providers (Australian Bureau of Meteorology, JAXA) and integrate alerts into operational procedures
• Establish backup communication protocols (HF radio, satellite phone, terrestrial fiber) for operations dependent on satellite links
• Evaluate parametric space weather insurance products for critical infrastructure assets
• Participate in national or industry-level space weather tabletop exercises to test response procedures

FAQ

Q: How likely is an extreme geomagnetic storm in the next decade? A: Based on historical data, the probability of a Carrington-class event (Dst below -850 nT) in any given decade is approximately 1.6 to 12%, depending on the statistical model used (Riley, 2012; Chapman et al., 2020). A storm comparable to the 1989 Quebec event (Dst around -600 nT) has a roughly 30 to 40% probability per solar cycle (approximately 11 years). The current Solar Cycle 25 has been more active than initially predicted, with peak sunspot numbers exceeding 200, increasing the near-term probability of severe storms through 2027.

Q: What is the realistic cost of hardening critical infrastructure against extreme space weather? A: AEMO estimated that protecting Australia's highest-risk transformers (approximately 50 units) with neutral blocking devices and enhanced monitoring would cost AUD 150 to 250 million, less than 0.5% of the estimated AUD 60 to 100 billion economic impact of a weeks-long grid outage from an extreme event. For individual businesses, upgrading GNSS equipment from single-frequency GPS to multi-constellation dual-frequency systems typically costs $2,000 to $15,000 per unit, with immediate benefits in normal operating precision as well as storm resilience.

Q: Should Asia-Pacific companies outside Australia and Japan be concerned? A: Yes, but the risk profile differs by latitude and sector. Companies in equatorial regions (Indonesia, Malaysia, Thailand, Vietnam, Philippines, India) face lower GIC risk but higher GPS and satellite communication disruption risk from ionospheric scintillation. Any organization dependent on satellite-based timing for financial transactions, precision positioning for logistics or agriculture, or satellite communications for remote operations has material space weather exposure regardless of latitude. The May 2024 storm demonstrated that even moderate events can disrupt operations across the entire region.

Q: Are there early warning systems specifically for the Asia-Pacific region? A: Japan's NICT (National Institute of Information and Communications Technology) operates the most comprehensive space weather monitoring system in Asia-Pacific, providing real-time ionospheric and geomagnetic data. Australia's Bureau of Meteorology launched its Space Weather Forecasting Centre in 2024, serving the Southern Hemisphere. India's ISRO provides equatorial ionospheric monitoring through its network of GPS receivers and ionosondes. However, Southeast Asian countries currently lack indigenous monitoring capability and depend on these larger national programs for warnings.

Sources

• NOAA Space Weather Prediction Center. (2024). May 2024 Geomagnetic Storm: Post-Event Analysis and Impact Assessment. Boulder, CO: NOAA.
• Lloyd's of London & Atmospheric and Environmental Research. (2023). Solar Storm Risk to the North American Electric Grid. London: Lloyd's.
• Electric Power Research Institute. (2024). Geomagnetically Induced Currents: Transformer Vulnerability Assessment and Mitigation Strategies. Palo Alto, CA: EPRI.
• Australian Space Agency. (2024). Space Weather Impact on GNSS Services: May 2024 Event Assessment. Adelaide: ASA.
• Australian Energy Market Operator. (2025). Geomagnetic Disturbance Preparedness Plan: Grid Resilience Assessment. Melbourne: AEMO.
• Japan Aerospace Exploration Agency. (2024). QZSS Performance During Geomagnetic Storm Conditions: Service Continuity Report. Tsukuba: JAXA.
• Indian Space Research Organisation. (2025). Equatorial Ionospheric Scintillation During the May 2024 Geomagnetic Storm. Bangalore: ISRO.
• TransGrid. (2025). GIC Mitigation Program: Neutral Blocking Device Deployment and Performance Report. Sydney: TransGrid.
• Sangeetha Abdu Jyothi. (2024). Solar Superstorms: Planning for an Internet Apocalypse. Science, 383(6684), 892-897.