3 Apr 2026·Source: The Hindu

4 min

Science & TechnologyNEWS

ISRO Invites Scientific Community to Utilize Aditya-L1 Solar Data

ISRO has opened its Aditya-L1 solar observatory for the Indian scientific community, inviting proposals to use observation time for solar physics research.

UPSC●SSC

Quick Revision

ISRO has released its second Announcement of Opportunity (AO) for the Aditya-L1 mission.

Aditya-L1 is India's first dedicated space-based solar mission.

The mission continuously observes the Sun from the Sun-Earth L1 point.

Scientific data from Aditya-L1 is regularly released in the public domain for global scientific utilization.

Proposals are invited to utilize observation time from the Visible Emission Line Coronagraph (VELC) and the Solar Ultraviolet Imaging Telescope (SUIT).

Proposals must be submitted electronically through the Aditya-L1 Proposal Processing System (ALPPS) hosted at the Indian Space Science Data Centre (ISSDC).

Key Dates

Approved observations for this second AO cycle will be conducted between July 2026 and September 2026.The deadline for submission of proposals is April 30, 2026.

Key Numbers

Over @@27 TB@@ of data is currently in the public domain from Aditya-L1.

Visual Insights

Aditya-L1 Mission: Key Data Points

Key statistics related to the Aditya-L1 mission and its data dissemination.

Data Available for Scientific Exploration: 27+ terabytes
Second Announcement of Opportunity (AO) Issued: 2026
Aditya-L1 Mission Launch: September 2, 2023
Aditya-L1 Insertion into L1 Halo Orbit: January 6, 2024

Mains & Interview Focus

Don't miss it!

ISRO's decision to issue a second Announcement of Opportunity for Aditya-L1 data represents a critical pivot in India's space strategy. This move transcends mere mission execution; it signifies a robust commitment to maximizing the scientific return on investment by fostering a collaborative research ecosystem. Such initiatives are indispensable for complex scientific endeavors like solar physics, which demand diverse expertise and analytical perspectives.

The sheer volume of data, exceeding 27 TB, coupled with the advanced capabilities of instruments like the Visible Emission Line Coronagraph (VELC) and the Solar Ultraviolet Imaging Telescope (SUIT), presents an unparalleled opportunity for Indian researchers. This approach aligns seamlessly with global trends in open science and data sharing, thereby elevating India's standing within the international space research community. It demonstrates a maturity in our space program, moving beyond technological prowess to scientific leadership.

Strategically, understanding solar dynamics is paramount. Accurate prediction of space weather is vital for safeguarding critical national infrastructure, including communication satellites, power grids, and navigation systems. Furthermore, this initiative serves as an invaluable talent pipeline, actively engaging younger scientists and academic institutions in cutting-edge research, ensuring a sustained flow of expertise into the sector.

This proactive data dissemination policy, facilitated through the Aditya-L1 Proposal Processing System (ALPPS), contrasts favorably with more insular approaches seen in some other spacefaring nations. It underscores a belief that collective intelligence yields superior scientific outcomes. India's space program, through such transparent and collaborative frameworks, is not just exploring the cosmos but also cultivating a vibrant domestic scientific enterprise.

Exam Angles

Science & Technology: Space missions, astronomy, solar physics, instrumentation.

GS Paper III: Achievements of Indians in science & technology; indigenization of technology; awareness in the fields of space.

Potential Prelims Questions: Mission objectives, payloads, orbital points, scientific significance.

Potential Mains Questions: India's space program, contribution to astrophysics, challenges in space exploration.

View Detailed Summary

Summary

Aditya-L1 is India's special satellite that continuously watches the Sun from a unique spot in space. ISRO is now inviting scientists across India to submit proposals to use the vast amount of data collected by this satellite. This effort aims to help everyone learn more about the Sun and maximize the mission's scientific discoveries.

The Indian Space Research Organisation (ISRO) has issued its second Announcement of Opportunity (AO) for the Aditya-L1 mission, India's pioneering space-based solar observatory. This invitation specifically targets the Indian scientific community, encouraging proposals for utilizing observation time on critical payloads. The primary instruments available for research include the Visible Emission Line Coronagraph (VELC) and the Solar Ultraviolet Imaging Telescope (SUIT).

The mission, currently positioned at the Sun-Earth L1 Lagrange point, is continuously gathering solar data. This second AO aims to broaden the scientific utilization of Aditya-L1's unique observational capabilities, maximizing the return on investment and fostering deeper understanding of solar phenomena. The initiative is crucial for advancing India's capabilities in space-based astronomy and solar physics research.

This development is highly relevant for the UPSC Civil Services Exam, particularly for the Science & Technology and General Studies papers.

Background

The Aditya-L1 mission is India's first dedicated space mission to study the Sun. Launched on September 2, 2023, it aims to provide deeper insights into solar dynamics, solar wind, and the Sun's influence on Earth's space environment. The mission carries seven payloads, including coronagraphs and spectrometers, designed to observe the Sun's outer layers and study solar emissions across various wavelengths. The selection of the Sun-Earth L1 point is strategic, offering an uninterrupted view of the Sun without any occultation or eclipses, which is crucial for continuous solar observation.

The development of indigenous space-based observatories like Aditya-L1 is part of India's broader strategy to enhance its capabilities in space science and technology. ISRO has a history of successful space missions, including Chandrayaan and Mangalyaan, demonstrating India's growing prowess in space exploration and scientific research. Encouraging the scientific community to utilize mission data through Announcements of Opportunity (AO) is a standard practice to maximize scientific returns and foster collaborative research.

Latest Developments

Following its successful launch and journey to the L1 point, Aditya-L1 has commenced its scientific observations. The mission's payloads are expected to gather unprecedented data on solar flares, coronal mass ejections, and the solar atmosphere. ISRO's initiative to issue a second AO signifies that the initial data collection phase is progressing well and the mission is ready for broader scientific engagement. This call for proposals will allow researchers to propose specific observation campaigns and data analysis projects, potentially leading to new discoveries about solar behavior and its impact on space weather.

The data from Aditya-L1 is expected to contribute significantly to space weather forecasting, which is crucial for protecting satellites, communication systems, and power grids from solar disturbances. By enabling the Indian scientific community to actively participate in data analysis, ISRO aims to build domestic expertise in heliophysics and foster a culture of scientific inquiry around solar research. Future AOs may be released as the mission progresses and new scientific objectives are identified.

Practice Questions (MCQs)

1. With reference to the Aditya-L1 mission, consider the following statements: 1. It is India's first space-based solar observatory. 2. The mission is designed to study the Sun's photosphere, chromosphere, and corona. 3. Aditya-L1 is currently positioned at the Sun-Earth L2 Lagrange point for its observations. Which of the statements given above is/are correct?

A.1 only
B.1 and 2 only
C.2 and 3 only
D.1, 2 and 3

Show Answer

Answer: B

Statement 1 is CORRECT. Aditya-L1 is indeed India's first space-based solar observatory. Statement 2 is CORRECT. The mission's payloads are designed to observe the Sun's outer layers, including the photosphere, chromosphere, and corona, and study solar emissions. Statement 3 is INCORRECT. Aditya-L1 is positioned at the Sun-Earth L1 Lagrange point, not L2. The L1 point provides an unobstructed view of the Sun.

2. Which of the following payloads are part of the Aditya-L1 mission, as mentioned in the Announcement of Opportunity?

A.Visible Emission Line Coronagraph (VELC) and Solar X-ray Spectrometer (SOXS)
B.Solar Ultraviolet Imaging Telescope (SUIT) and Plasma Analyzer Package (PAP)
C.Visible Emission Line Coronagraph (VELC) and Solar Ultraviolet Imaging Telescope (SUIT)
D.Coronagraph for Imaging Solar Flares (CISF) and Magnetometer (MAG)

Show Answer

Answer: C

The enriched summary explicitly mentions that the second Announcement of Opportunity (AO) invites proposals for utilizing observation time on key payloads like the Visible Emission Line Coronagraph (VELC) and the Solar Ultraviolet Imaging Telescope (SUIT). While SOXS, PAP, CISF, and MAG might be part of the Aditya-L1 mission, they are not the ones specifically highlighted in the context of this particular AO for community utilization.

3. Consider the following statements regarding the Sun-Earth L1 Lagrange point: 1. It is a point of gravitational equilibrium between the Sun and the Earth. 2. A spacecraft placed at L1 can orbit the Sun at the same rate as the Earth, allowing it to remain in a fixed position relative to both. 3. The James Webb Space Telescope (JWST) is positioned at the Sun-Earth L1 point. Which of the statements given above is/are correct?

A.1 only
B.1 and 2 only
C.2 and 3 only
D.1, 2 and 3

Show Answer

Answer: B

Statement 1 is CORRECT. The L1 point is one of five points where a small object can orbit the Sun in formation with the Earth. It is a point of gravitational equilibrium. Statement 2 is CORRECT. A spacecraft at L1 orbits the Sun at the same rate as Earth, which is why it stays in a fixed position relative to the Sun and Earth. Statement 3 is INCORRECT. The James Webb Space Telescope (JWST) is located at the Sun-Earth L2 Lagrange point, not L1. L1 is ideal for solar observation, while L2 is suitable for astronomical observation away from Earth's heat and light.