New study captures Sun’s early warning signs before solar flares

Science & Technology · 1 September 2026 · Based on The Hindu (original report)

2-minute summary

A collaborative study by the Indian Space Research Organisation (ISRO), the Manipal Academy of Higher Education, and other academic institutions has captured early warning signs of solar flares using data from India's Aditya-L1 mission. By analyzing simultaneous ultraviolet (UV) and X-ray observations from three onboard payloads—the Solar Ultraviolet Imaging Telescope (SUIT), the Solar Low Energy X-ray Spectrometer (SoLEXS), and the High Energy L1 Orbiting X-ray Spectrometer (HEL1OS)—researchers identified small, short-lived brightening 'transient events' in the Sun's atmosphere. These events occur in active regions hours before a major solar flare and cluster around the eventual eruption site. The study suggests that these repeated, small-scale energy releases progressively destabilize the local magnetic field, ultimately triggering a massive solar flare. Because Earth's atmosphere absorbs most UV radiation, space-based instruments like SUIT are essential for these observations. This breakthrough enhances our understanding of solar physics and moves scientists closer to reliable space weather forecasting, which is critical for protecting satellites, global communication networks, power grids, and astronauts from damaging solar radiation.

Why it's in the news

A collaborative study using data from India's Aditya-L1 mission has successfully identified pre-flare 'transient events' that act as early warning signs for major solar flares. This discovery, published in August 2026, provides critical insights into the magnetic destabilization processes of the Sun, paving the way for advanced space weather forecasting.

Background and context

The Sun is a dynamic star that undergoes periodic activity, releasing massive amounts of energy through solar flares and Coronal Mass Ejections (CMEs). These phenomena are driven by the twisting and reconnection of magnetic field lines in active solar regions. When directed toward Earth, these high-energy particles can cause geomagnetic storms, disrupting satellite operations, GPS navigation, high-frequency radio communications, and electrical power grids. To study these phenomena, ISRO launched Aditya-L1 in September 2023. Positioned at the Lagrange Point 1 (L1), approximately 1.5 million kilometers from Earth, the spacecraft enjoys an uninterrupted view of the Sun. Understanding the precursor events of solar flares has long been a challenge in solar physics. This study utilizes Aditya-L1's unique multi-wavelength observation capabilities to bridge the gap between lower-atmospheric activity (observed in UV) and high-energy coronal releases (observed in X-rays), offering a predictive model for solar eruptions.

Government schemes

• Aditya-L1 Mission — India's first space-based observatory-class mission to study the Sun, positioned at the L1 Lagrange point.

Previous UPSC questions on this theme

• Prelims GS-1 2022 — If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth ? 1. GPS and navigation systems could fail. 2. Tsunamis could occur at equatorial regions. 3. Power grids could be damaged. 4. Intense auroras could occur over much of the Earth. 5. Forest fires could take place over much of the planet. 6. Orbits of the satellites could be disturbed. 7. Shortwave radio communication of the aircraft flying over polar regions could be interrupted. Select the correct answer using the code given below : (a) 1, 2, 4 and 5 only (b) 2, 3, 5, 6 and 7 only (c) 1, 3, 4, 6 and 7 only (d) 1, 2, 3, 4, 5, 6 and 7

Mains practice: Discuss the significance of India's Aditya-L1 mission in advancing our understanding of solar physics and space weather forecasting. How do recent findings on pre-flare transient events contribute to safeguarding global technological infrastructure?

India's Aditya-L1, positioned at the Lagrange Point 1, is a milestone in solar physics. A recent collaborative study using its data has uncovered critical pre-flare 'transient events' that act as early warning signs for major solar flares, showcasing the mission's immense scientific value.

**Significance in Advancing Solar Physics and Space Weather Forecasting:**

• **Multi-Wavelength Observation:** By combining ultraviolet data from the SUIT payload with X-ray data from SoLEXS and HEL1OS, scientists can trace energy transfer from the lower solar atmosphere (photosphere and chromosphere) to the corona.

• **Unlocking Flare Mechanics:** The discovery of pre-flare transient events reveals that repeated, small-scale energy releases progressively destabilize local magnetic fields, providing a physical model for how major flares are triggered.

• **Predictive Capabilities:** Identifying these localized, short-lived brightenings hours before an eruption moves science closer to reliable, high-precision solar flare forecasting.

**Contribution to Safeguarding Global Infrastructure:**

• **Satellite Protection:** Early warnings allow operators to put satellites into safe modes, preventing damage to sensitive electronics from high-energy solar particles.

• **Communication and Navigation Systems:** Solar flares disrupt the ionosphere, affecting GPS and high-frequency radio communications. Timely alerts help aviation and marine sectors mitigate navigation failures.

• **Power Grid Resilience:** Geomagnetic storms induced by solar flares can cause catastrophic grid failures. Predictive data enables power utilities to manage load distributions proactively.

In conclusion, the insights from Aditya-L1 transition space weather management from a reactive posture to a predictive one, safeguarding humanity's increasingly space-dependent technological infrastructure.

Prelims practice questions

Q1. With reference to the payloads of India's Aditya-L1 mission, consider the following pairs: 1. SUIT: Observes the Sun in near-ultraviolet (NUV) wavelengths to study the photosphere and chromosphere. 2. SoLEXS: Measures low-energy X-ray emissions from the solar corona. 3. HEL1OS: Monitors high-energy X-ray emissions during solar flares. Which of the pairs given above are correctly matched?

1. 1 and 2 only
2. 2 and 3 only
3. 1 and 3 only
4. 1, 2 and 3

Answer: D. All three pairs are correctly matched. The Solar Ultraviolet Imaging Telescope (SUIT) observes the Sun in NUV filters (photosphere to chromosphere). The Solar Low Energy X-ray Spectrometer (SoLEXS) and the High Energy L1 Orbiting X-ray Spectrometer (HEL1OS) measure X-ray emissions produced by energetic processes in the solar corona.

Q2. Why are Near-Ultraviolet (NUV) observations of solar phenomena, such as those conducted by the SUIT payload on Aditya-L1, primarily carried out from space-based observatories rather than ground-based telescopes?

1. Earth's magnetic field deflects ultraviolet photons.
2. The Sun's NUV emissions are only directed towards the Lagrange points.
3. Earth's atmosphere absorbs most of the ultraviolet radiation.
4. Ground-based telescopes suffer from gravitational lensing distortions.

Answer: C. As stated in the article, NUV wavelengths are largely inaccessible from the ground because Earth’s atmosphere absorbs most ultraviolet radiation. Therefore, space-based observatories are required to capture these wavelengths.

Q3. According to the recent findings from the Aditya-L1 mission data, which of the following best describes the mechanism that triggers a major solar flare?

1. Repeated small-scale energy releases that progressively destabilize the magnetic field in an active region.
2. A sudden drop in the core temperature of the Sun.
3. The gravitational pull of outer planets disrupting the solar photosphere.
4. The collision of high-energy cosmic rays with the solar corona.

Answer: A. The study suggests that repeated small-scale energy releases (pre-flare transient events) progressively destabilize the magnetic field in an active region, eventually leading to a large solar flare.

Revision flashcards

• What is the primary function of the SUIT payload on Aditya-L1? The Solar Ultraviolet Imaging Telescope (SUIT) observes the Sun in 11 near-ultraviolet (NUV) filters, revealing different layers from the upper photosphere to the chromosphere.
• Why must Near-Ultraviolet (NUV) solar observations be conducted from space? Because Earth's atmosphere absorbs most ultraviolet radiation, making NUV wavelengths largely inaccessible from ground-based telescopes.
• What are 'pre-flare transient events' as discovered by the Aditya-L1 study? Small, short-lived brightenings in the Sun's atmosphere that appear hours before a major solar flare and cluster around the spot where the flare later occurs.
• Which Aditya-L1 payloads measure X-ray emissions from the solar corona? SoLEXS (Solar Low Energy X-ray Spectrometer) and HEL1OS (High Energy L1 Orbiting X-ray Spectrometer).
• How do pre-flare transient events lead to major solar flares? They represent repeated small-scale releases of magnetic energy that progressively destabilize the magnetic field in an active region, eventually triggering a large flare.