ISRO’s Aditya-L1: India’s Solar Mission
- The Indian Space Research Organisation (ISRO) is embarking on a new mission to study the Sun.
- Unlike lunar landings, Aditya L1 will not touch the Sun.
- Lagrange points are locations where the gravitational forces of two large bodies,such as the Sun and Earth,balance each other.
India’s Aditya L1 Mission Set to Study the Sun
updated September 4, 2023
The Indian Space Research Organisation (ISRO) is embarking on a new mission to study the Sun. Fresh off the success of Chandrayaan 3, the Aditya L1 mission aims to observe our nearest star from a unique vantage point in space. This solar mission, India’s first, seeks to deepen our understanding of the Sun’s dynamics and its impact on space weather.
Unlike lunar landings, Aditya L1 will not touch the Sun. Instead, it will journey 1.5 million kilometers from Earth to orbit Lagrange point L1. This location offers a stable position with an uninterrupted view of the Sun.The spacecraft is expected to take four months to reach its destination,where it will then spend five years studying the Sun.
Lagrange points are locations where the gravitational forces of two large bodies,such as the Sun and Earth,balance each other. This equilibrium allows spacecraft to maintain a stable orbit with minimal energy expenditure. L1 provides a continuous, unobstructed view of the Sun, making it ideal for solar observations. Other solar telescopes, like the Solar and Heliospheric Observatory (SOHO), have also been stationed at L1.
The Sun,109 times larger than Earth in diameter and 333,000 times more massive,is a dynamic sphere of superheated plasma.Its layers include a core reaching 15 million degrees Celsius, a radiation zone, a convective zone, and the visible surface known as the photosphere.Above the photosphere lie the chromosphere, a transition region, and the corona, the Sun’s outermost layer with temperatures soaring to millions of degrees Celsius.
One of the enduring solar mysteries is the temperature disparity between the Sun’s layers.Scientists are puzzled by why the corona is significantly hotter than the photosphere. aditya L1’s observations may provide clues to this puzzle. From Earth, we primarily see the photosphere, but solar eclipses offer glimpses of the reddish chromosphere and the faint halo of the corona.
To unravel these solar mysteries, Aditya L1 carries seven instruments, or payloads. These will observe the photosphere, chromosphere, and corona. Four instruments will directly study the Sun, while the remaining three will measure conditions around Lagrange point L1.
The instruments include:
- Visible Emission Line Coronagraph (VELC): To study the corona and coronal mass ejections (CMEs).
- Solar Ultraviolet Imaging Telescope (SUIT): To image the photosphere and chromosphere in ultraviolet light.
- solar Low Energy X-ray Spectrometer (SOLEXS) and High Energy L1 Orbiting X-ray Spectrometer (HEL1OS): To study X-rays emitted by the Sun,especially during solar flares.
- Aditya Solar Wind Particle Experiment (ASPEX) and Plasma Analyzer Package for Aditya (PAPA): To analyze the solar wind.
- Magnetometer (MAG): To measure magnetic fields at L1.
Aditya L1 joins other solar missions, such as NASA’s parker Solar Probe and the joint NASA/ESA Solar Orbiter, in the quest to understand the Sun. These missions aim to improve our knowledge of solar emissions and behavior.
Aditya-L1’s launch date is an vital moment in space history. It was launched with the help of PSLV-XL launch vehicle at 11 :50 IST. It has achieved its intended orbit nearly an hour later, and separated from the 4th stage at 12:57 IST.
What’s next
The Aditya L1 mission represents a critically important step forward in solar research and space technology. By strategically positioning itself at Lagrange point L1, the spacecraft will embark on a five-year journey to unlock the secrets of our Sun. The data and insights gathered by Aditya L1’s instruments promise to enhance our understanding of solar phenomena and their effects on Earth.