Context:
Aditya-L1 is a dedicated satellite mission by the Indian Space Research Organisation (ISRO) designed to study the Sun’s atmosphere, magnetic storms, and their impact on Earth’s environment.
Location: The L1 Point
The mission is named after its destination: Lagrange Point 1 (L1). This is a gravitationally stable spot located about 1.5 million kilometers from Earth, directly toward the Sun.
- Continuous View: Unlike satellites in Earth’s orbit, a spacecraft at L1 is never blocked by the Earth or the Moon (no eclipses). This allows for 24/7 monitoring of the Sun.
- Fuel Efficiency: The balanced gravity of the Sun and Earth allows the satellite to “hover” with minimal fuel consumption.
Scientific Objectives
Aditya-L1 aims to solve several long-standing mysteries in solar physics:
- The Coronal Heating Problem: Scientists want to understand why the Sun’s outer atmosphere (the Corona) is millions of degrees hotter than its surface (the Photosphere), which is only about 6,000°C.
- Space Weather: Studying Coronal Mass Ejections (CMEs) and solar flares that can disrupt satellite communications, GPS, and power grids on Earth.
- Solar Wind: Observing the origin and acceleration of the constant stream of charged particles flowing from the Sun.
The Seven Payloads
The spacecraft carries seven indigenous instruments, divided into two categories:
Remote Sensing Payloads (Looking at the Sun)
- VELC (Visible Emission Line Coronagraph): Studies the solar corona and CMEs.
- SUIT (Solar Ultra-violet Imaging Telescope): Images the solar Photosphere and Chromosphere in near Ultra-violet.
- SoLEXS & HEL1OS: X-ray spectrometers to study solar flares across different energy levels.
In-situ Payloads
- ASPEX & PAPA: Analyzes solar wind particles (protons, alpha particles, and ions).
- MAG (Advanced Tri-axial High Resolution Digital Magnetometer): Measures the magnetic field at the L1 point.
Current Updates (2026)
As of early 2026, Aditya-L1 is in its Science Phase. ISRO has recently released the Second Announcement of Opportunity (AO), inviting Indian scientists to submit proposals for specific observation time on the satellite’s instruments. The mission continues to provide critical data that is shared globally to improve space weather forecasting.
CONCEPTUAL MCQs
Q1. What is the primary advantage of placing Aditya-L1 at the Lagrange Point 1?
A) It is the closest a spacecraft can get to the Sun.
B) It allows for continuous observation of the Sun without any eclipses.
C) It is the only place where solar wind does not exist.
D) It allows the satellite to land on the Sun’s surface.
Q2. Which payload is specifically designed to solve the “Coronal Heating” mystery?
A) PAPA
B) VELC
C) MAG
D) ASPEX
ANSWERS
Q1: B | Q2: B | Q3: B
EXAM RELEVANCE
| Exam | Focus Area | Relevance |
| UPSC CSE | GS-3 Science & Tech (Space missions & Solar physics) | High |
| SSC / PSC | General Awareness: ISRO milestones and payload names | High |
