What makes ISRO's Aditya L1 Mission to the Sun Unique?

The Aditya L1 spacecraft, which is named after a Sanskrit name for the Sun, will be launched on September 02, 2023 . The launch will take place at the Satish Dhawan Space Centre (SDSC SHAR) in Sriharikota using the PSLV XL launch vehicle.

Studying the Sun's atmosphere

The spacecraft will orbit around a point called Lagrange point 1 (L1), which is about 93 million miles or 149 million kilometers away from the Sun. It will perform a 'Surya Namaskar' as it does so. This mission aims to study and research the Sun's atmosphere, environment, and all related aspects.

Four of the payloads on Aditya L1 observe the Sun directly from its position at L1, while three focus on examining particles and fields in that area. These investigations aid in understanding the impact of solar activity on interplanetary space.

The Aditya L1 payload aims to gather vital data on different aspects of the sun, including coronal heating and coronal mass ejections. The L1 point, discovered by mathematician Joseph Louis Lagrange, is a significant Lagrangian point situated approximately 1.5 million kilometers within Earth's orbit, positioned between the Sun and the Earth. At the specific points, the gravitational forces between two objects become equal or neutral, allowing spacecraft to maintain a stationary position with minimal fuel consumption.

The L1 point of the Earth-Sun system, where the Solar and Heliospheric Observatory Satellite (SOHO) is positioned, provides an uninterrupted and unobstructed view of the sun.

Journey towards L1 Lagrange point

Once Aditya L1 reaches Low Earth Orbit (LEO), it will use its onboard thrusters to move towards the L1 Lagrange point. To achieve this, a sequence of elliptical orbital maneuvers will be performed, gradually increasing its orbit until it reaches the desired L1 Lagrange point. After Aditya L1 arrives at the L1 Lagrange point, it will be placed in a halo orbit, enabling the satellite to maintain a stable position between Earth and the Sun.

Data collection and mission objectives

The Aditya L1 spacecraft will analyze the behavior of the Sun's chromosphere and corona, as well as its magnetic field and solar flares. The information gathered during this mission will enhance scientists' knowledge of the Sun and its effects on Earth.

The Aditya L1 mission is a complex and challenging task, but it has the potential to provide valuable insights into the Sun and its impact on Earth. The mission is expected to have a life of around 4 to 5 years.