Aditya-L1 Finds Solar Eruptions Expand Unevenly
Why in News?
- Scientists using India's Aditya-L1 solar observatory found that solar eruptions do not spread evenly, The Tribune reported on 3 November 2026.
- The study, led by the Indian Institute of Astrophysics, examined a coronal mass ejection of 5 August 2024 near the Sun's western edge and was published in The Astrophysical Journal Letters.
- The Science and Technology Ministry said the Visible Emission Line Coronagraph helped track hot material moving toward and away from the spacecraft, News On AIR reported.
- A uniform-expansion model could not explain the data, but a tilted, unevenly expanding model matched it.
Key Terminologies
- Coronal Mass Ejection
- A large eruption of hot, magnetised gas from the Sun's outer atmosphere into space. When it reaches Earth, it can disturb the planet's magnetic field.
- Visible Emission Line Coronagraph
- Aditya-L1's main instrument. It blocks the Sun's bright disc and observes green light from highly heated iron atoms in the corona. Shifts in the light show whether material moves toward or away from the observer.
- Space Weather
- Disturbances in near-Earth space caused by solar activity. They can affect satellites, GPS and communication networks.
- L1 Point
- A point between the Earth and the Sun, about 1.5 million km from Earth, where Aditya-L1 is stationed. It gives a continuous view of the Sun.
- Solar Dynamics Observatory
- A NASA spacecraft whose Atmospheric Imaging Assembly tracked how the eruption moved across the sky in this study.
Key Issues
- Eruption Shape: The study found that the eruption of 5 August 2024 expanded unevenly into irregular shapes, and a uniform-expansion model could not explain the observations. Assuming simple shapes can mislead forecasts of speed and direction.
- Motion Along the Line of Sight: The Visible Emission Line Coronagraph measured wavelength shifts in light from heated iron atoms, which showed motion toward and away from the observer. Images alone cannot show this.
- Combining Instruments: The team combined Aditya-L1 data with NASA's Solar Dynamics Observatory and a three-dimensional geometric-kinematic model. Joint use of space instruments improves understanding.
- Space Weather Risk: Eruptions can disturb Earth's magnetic field and affect satellites, GPS and communication networks, The Tribune reported. Better shape models could improve impact predictions.
- Cross-Checking Missions: On 16 October 2026 The Tribune reported a first joint analysis of eruptions by Aditya-L1's coronagraph and the European Proba-3 coronagraph, whose estimates of mass and thermal energy agreed well. Independent checks make results stronger.
Key Implications
Positive/Pros/Merits
- Indian Science Leadership: A study led by the Indian Institute of Astrophysics, an autonomous institution under the Department of Science and Technology, was published in a leading journal.
- Early Career Researchers: The lead author is a doctoral student, Saurabh Tripathi, with Tanmoy Samanta as corresponding author, which shows a growing research base.
- Practical Use: Better models of eruption shape and spread could improve predictions of space weather effects on satellites and navigation.
- Global Cooperation: The work used NASA's Solar Dynamics Observatory alongside Aditya-L1 data, which builds international scientific links.
Negative/Cons/Demerits
- Single Event: The study examined one eruption, so more events are needed to show that uneven expansion is general.
- Limited Details: The News On AIR report gave no journal or institution names, and the Tribune report gives no numbers on speed or mass, so quantitative benefits are unclear.
- Forecast Gap: A better model of a past eruption does not itself give advance warning of the next one.
- Mission Dependence: Aditya-L1 sits at the L1 point and carries seven scientific instruments, so any instrument failure would reduce data.
Key Initiatives
- Aditya-L1, Indian Space Research Organisation: India's first space-based solar observatory was launched in September 2023 and sits at the Sun-Earth L1 point about 1.5 million km away, with seven instruments.
- Indian Institute of Astrophysics: It led the study on uneven expansion, with researchers Saurabh Tripathi, Tanmoy Samanta and Jayant Joshi.
- National Aeronautics and Space Administration: Its Solar Dynamics Observatory tracked the eruption across the sky for the combined analysis.
- European Space Agency, Proba-3: It was launched in December 2024 on ISRO's PSLV-XL, and its formation-flying coronagraph was used with Aditya-L1 in a joint study reported on 16 October 2026.
The Science and Technology Ministry says the Visible Emission Line Coronagraph gives information that images alone cannot show. The researchers say better models of eruption shape could improve predictions of space weather impact. The study covers one eruption, and further events are needed.
Director's Perspective
Way Forward
- Release the data and model code of the study, so other teams can test it on more eruptions.
- Fund long-term joint observations by Aditya-L1 and foreign missions during solar maximum.
- Build an Indian space weather forecasting service that uses these models for satellite operators.
- Train more doctoral students in solar physics through the Indian Institute of Astrophysics and universities.
- Publish plain-language summaries of results so schools and the public follow Indian space science.
The finding is a good scientific result with real but still modest practical reach. Aditya-L1's coronagraph measured motion that images cannot show, and the combined model matched the eruption better than a uniform one. However, the study covers a single eruption, and no forecast tool has yet resulted. In a Mains answer, credit the contribution to understanding space weather and the role of Indian researchers, then conclude that more events, open data and operational forecasting are needed to protect satellites.
GS Relevance
Frequently Asked Questions
What did Aditya-L1 find about solar eruptions?
Aditya-L1 helped show that solar eruptions expand unevenly into irregular shapes, The Tribune reported on 3 November 2026. A study of a coronal mass ejection of 5 August 2024 found that a tilted, unevenly expanding model matched observations while a uniform-expansion model did not.
Which institution led the study?
The Indian Institute of Astrophysics, an autonomous institution under the Department of Science and Technology, led the study, which was published in The Astrophysical Journal Letters. Saurabh Tripathi is the lead author and Tanmoy Samanta the corresponding author, according to The Tribune.
Why do solar eruptions matter for Earth?
Coronal mass ejections can disturb Earth's magnetic field and affect satellites, GPS and communication networks, The Tribune reported on 3 November 2026. Better understanding of their shape and spread could improve predictions of how strongly they will affect space systems.
PYQ Practice — Statement Analysis
1 Aditya-L1 is stationed at the Sun-Earth L1 point, about 1.5 million km from Earth.
It carries seven scientific instruments and was launched in September 2023.
2 The Visible Emission Line Coronagraph observes green light from highly heated iron atoms in the corona.
Wavelength shifts in the light show motion toward or away from the observer.
3 The 2026 study found that solar eruptions expand perfectly evenly in all directions.
It found they expand unevenly into irregular shapes.