Aditya-L1 and Proba-3 Study Solar Eruptions
Why in News?
- On 16 October 2026, the Indian Space Research Organisation shared details of the first joint analysis of solar eruptions seen by India's Aditya-L1 and Europe's Proba-3.
- Both spacecraft observed the same coronal mass ejections. The aim is to understand how these eruptions develop and affect Earth, more fully than one spacecraft can.
- The study was led by researchers of the Indian Institute of Astrophysics with European and American colleagues, and was published in Astronomy and Astrophysics.
- The mass and thermal energy estimates from the two instruments agree well, despite different viewing conditions.
Key Terminologies
- Coronal Mass Ejection
- A large eruption in which magnetised plasma is thrown from the Sun into space. Earth-directed ejections can cause geomagnetic storms and disturb satellites, navigation and communications.
- Coronagraph
- An instrument that blocks the Sun's bright disc to reveal the faint outer atmosphere, called the corona. It works like an artificial eclipse inside the instrument.
- Visible Emission Line Coronagraph
- The main instrument on Aditya-L1. It images the inner corona and helps measure the properties of ejections close to the Sun.
- Formation Flying
- A technique in which two spacecraft fly together at a precise distance. In Proba-3 they fly about 150 metres apart, and one casts a shadow on the other.
Key Issues
- Early Evolution Is Hard to Track: The Tribune reports that observing eruptions very close to the Sun is difficult, and earlier coronagraphs could not follow the early evolution of faint ejections.
- Two Complementary Views: Aditya-L1's Visible Emission Line Coronagraph and Proba-3's ASPIICS coronagraph observed the same events. Their mass and thermal energy estimates agree well, which builds confidence in the method.
- Precision Technology: Proba-3, a European Space Agency mission launched in December 2024, flies two spacecraft about 150 metres apart. One shadows the other to create an artificial solar eclipse for ASPIICS.
- Space Weather Risk: Earth-directed ejections can cause geomagnetic storms that disrupt satellites, navigation and communications, which makes accurate measurement of their mass and energy important.
- Vantage Point Advantage: Aditya-L1, India's first dedicated solar mission launched in September 2023, sits in a halo orbit at the Sun-Earth vantage point and observes the Sun without interruption.
Key Implications
Positive/Pros/Merits
- Scientific Credibility: Agreement between two independent instruments strengthens the estimates of ejection mass and energy.
- International Collaboration: The joint work links Indian and European missions, and Proba-3 itself was launched on India's PSLV-XL from Sriharikota.
- Better Forecasting Base: Measurements close to the Sun can improve models of how ejections travel to Earth, which supports space weather warnings.
- Indian Research Strength: The study was led by the Indian Institute of Astrophysics, which shows the scientific use of Aditya-L1 data.
Negative/Cons/Demerits
- Early Stage: The study analyses selected events, and wider conclusions need many more joint observations.
- Different Viewing Geometry: The two instruments use different observing constraints and geometric assumptions, which limits direct comparison.
- Prediction Gap: Measuring an ejection near the Sun does not by itself predict its effect on Earth, which is an analytical point.
- Mission Dependence: Continued joint observation depends on both spacecraft operating, which is an analytical point.
Key Initiatives
- Aditya-L1, ISRO: It is India's first dedicated solar mission, launched in September 2023 into a halo orbit at the Sun-Earth vantage point, carrying the Visible Emission Line Coronagraph.
- Proba-3, European Space Agency: This mission was launched in December 2024 on India's PSLV-XL and is described as the world's first precision formation-flying mission.
- ASPIICS, European Space Agency: The coronagraph on Proba-3 images the corona under an artificial eclipse created by the two spacecraft flying about 150 metres apart.
- Joint Study, 2026: Researchers led by the Indian Institute of Astrophysics compared ejection mass, density and energy from both instruments, published in Astronomy and Astrophysics.
The Indian Space Research Organisation says the joint study shows the scientific potential of combining Aditya-L1 and Proba-3 observations. The researchers describe the consistency of the results as lending confidence to coordinated observation. The report reviewed gives no details of future joint campaigns.
Director's Perspective
Way Forward
- Plan regular joint observation campaigns between Aditya-L1 and Proba-3, so that more events are studied under common conditions.
- Share the calibrated datasets openly with universities, so that more groups can build ejection models.
- Link ejection measurements to Earth-side data on geomagnetic storms, to turn research results into usable warnings.
- Build national capability in formation flying and coronagraphy through future solar missions and training of young scientists.
The result is a solid scientific step, not yet an operational one. Agreement between an Indian and a European instrument is the kind of cross-checking that makes space science trustworthy. The limit is that it covers selected events and does not yet predict effects on Earth. In a Mains answer, credit the collaboration and the Indian research lead, then conclude that the next test is turning such measurements into reliable space weather forecasts.
GS Relevance
Frequently Asked Questions
What did Aditya-L1 and Proba-3 do together in October 2026?
The Indian Space Research Organisation shared on 16 October 2026 the first joint analysis of solar eruptions observed by Aditya-L1 and Europe's Proba-3. Researchers compared the mass and thermal energy of coronal mass ejections from both instruments and found that the estimates agree well.
What is a coronal mass ejection?
A coronal mass ejection is a large eruption in which magnetised plasma is thrown from the Sun into space. Earth-directed ejections can cause geomagnetic storms that disturb satellites, navigation and communications, so scientists study their mass and energy near the Sun.
What is special about the Proba-3 mission?
Proba-3 is a European Space Agency mission launched in December 2024 on India's PSLV-XL from Sriharikota. It is described as the world's first precision formation-flying mission, with two spacecraft about 150 metres apart creating an artificial solar eclipse.
PYQ Practice — Statement Analysis
1 Aditya-L1 is India's first dedicated solar mission.
It was launched in September 2023.
2 Proba-3 is an Indian Space Research Organisation mission launched on a GSLV rocket.
It is a European Space Agency mission launched on India's PSLV-XL.
3 A coronagraph blocks the Sun's bright disc so that the faint corona can be seen.
It works like an artificial eclipse.