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#1
Aditya-L1 is India's first dedicated space-based observatory specifically designed to observe and study the Sun.
#2
The mission operates under the executive authority of the Indian Space Research Organisation (ISRO), Department of Space, Government of India.
#3
The spacecraft is stationed in a periodic halo orbit around the Sun-Earth Lagrange Point 1 (L1), located approximately 1.5 million kilometres from Earth.
#4
Lagrange Point 1 represents an equilibrium position where the combined gravitational pull of the Sun and Earth equals the centripetal force required to maintain synchronous orbital motion.
#5
The L1 halo orbit enables continuous, uninterrupted observation of the solar disc without planetary occultation, eclipses, or day-night cycles.
#6
The mission was launched on September 2, 2023, at 11:50 IST from the Second Launch Pad of Satish Dhawan Space Centre (SDSC-SHAR) in Sriharikota, Andhra Pradesh.
#7
The launch vehicle utilized was the Polar Satellite Launch Vehicle in its XL configuration (PSLV-C57), equipped with six solid strap-on booster motors.
#8
The spacecraft executed its final halo orbit insertion maneuver on January 6, 2024, entering its operational halo path around L1.
#9
The concept was originally conceived in 2008 by the Advisory Committee for Space Sciences (ADCOS) as 'Aditya-1' for low-Earth orbit, before being upgraded to L1 multi-payload architecture in 2012.
#10
The nominal operational design life of the Aditya-L1 spacecraft in halo orbit is five years.
#11
The spacecraft carried a lift-off mass of approximately 1,475 kilograms, including an instrument payload dry mass of approximately 244 kilograms.
#12
Aditya-L1 carries exactly seven scientific instruments: four remote-sensing instruments and three in-situ measuring instruments.
#13
The Visible Emission Line Coronagraph (VELC), developed by the Indian Institute of Astrophysics (IIA) in Bengaluru, is the primary optical payload for coronal imaging and spectroscopy.
#14
The Solar Ultraviolet Imaging Telescope (SUIT), built by the Inter-University Centre for Astronomy and Astrophysics (IUCAA) in Pune, images the photosphere and chromosphere in near-ultraviolet (200–400 nm).
#15
Telemetry, tracking, command, and orbital maintenance are executed by ISRO Telemetry, Tracking and Command Network (ISTRAC) with support from the Indian Deep Space Network (IDSN) at Byalalu.
#16
The Solar Low Energy X-ray Spectrometer (SoLEXS) monitors soft X-ray emissions (1–22 keV) from solar flares, developed by the U R Rao Satellite Centre (URSC).
#17
The High Energy L1 Orbiting X-ray Spectrometer (HEL1OS) measures hard X-ray emissions (10–150 keV) to observe non-thermal electron acceleration during impulsive solar flare phases.
#18
The Aditya Solar wind Particle Experiment (ASPEX), developed by the Physical Research Laboratory (PRL), measures solar wind protons and alpha particles using SWIS and STEPS analyzers.
#19
The Plasma Analyser Package for Aditya (PAPA), developed by Space Physics Laboratory at Vikram Sarabhai Space Centre (VSSC), evaluates solar wind electrons and heavier ions.
#20
The Advanced Tri-axial High Resolution Digital Magnetometer, developed by LEOS Bengaluru, measures the interplanetary magnetic field (IMF) using a 6-metre deployable boom to minimize spacecraft magnetic interference.
#21
The primary scientific mandate focuses on resolving the coronal heating problem, where the outer corona exceeds one million Kelvin while the photosphere remains at roughly 5,778 Kelvin.
#22
Aditya-L1 tracks the triggers and propagation velocities of Coronal Mass Ejections (CMEs), which propel billions of tons of magnetized plasma across the heliosphere.
#23
Data generated by the mission provides early warning metrics for geomagnetic storms that threaten satellites, high-frequency communications, and terrestrial electrical grids.
#24
India became the first Asian nation to place a scientific spacecraft in a halo orbit around the Sun-Earth L1 Lagrange point.
#25
During the severe G5 geomagnetic storm of May 2024 (solar active region AR3664), Aditya-L1 payloads recorded major solar flares, coronal shocks, and charged particle flux enhancements.
Subject Specialist Commentary
Analytical perspective & practical exam advice from the Master10 academic board
Aditya-L1 is India's first dedicated space-based solar observatory. Launched by ISRO aboard a PSLV-C57 rocket in September 2023, the spacecraft operates in a halo orbit around Sun-Earth Lagrange Point 1, roughly 1.5 million kilometers from Earth. At this gravitational equilibrium point, the observatory views the Sun continuously without eclipses or occultation, tracking solar flares, coronal mass ejections, and the intense heating of the solar corona.
Science and technology questions in UPSC prelims and State PSC exams frequently target Aditya-L1's seven payloads. A common prelims trap confuses remote-sensing payloads with in-situ sensors: VELC and SUIT image the Sun remotely, whereas ASPEX, PAPA, and the magnetometer measure solar wind particles and magnetic fields at L1. Pay special attention to institutional developers: the primary coronagraph VELC was built by IIA Bengaluru, while the ultraviolet telescope SUIT was created by IUCAA Pune.
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