INDIAN SUN MISSION 2023: ADITYA-L1 List of Important Events

A satellite called Aditya-L1 is designed to conduct in-depth studies of the Sun. It has seven distinct payloads, all of which were produced locally. Five by ISRO and two by Indian academic institutions that collaborate with ISRO.

Sanskrit refers to the Sun as Aditya. Lagrange Here, the Sun-Earth system’s first point is referred to as L1. Conventional wisdom holds that the gravitational forces of two celestial bodies, such as the Sun and Earth, are in equilibrium at L1. As a result, an object can remain there rather steadily with regard to both heavenly bodies.

Aditya-L1 undertakes 5 manoeuvres to achieve the required velocity for its journey over the 16 days it spends in Earth-bound orbit after its scheduled launch on September 2, 2023. After its scheduled launch on September 2, 2023, Aditya-L1 makes 5 manoeuvres to reach the necessary velocity for its voyage during the course of the 16 days it spends in Earth-bound orbit.


The 110-day voyage of Aditya-L1 to the region near the L1 Lagrange point then begins with a Trans-Lagrangian 1 insertion operation. Once at the L1 point, another manoeuvre secures Aditya-L1 into an orbit around L1, the gravitational field equilibrium point between the Earth and the Sun. Throughout its entire mission, the satellite orbits L1 in an irregular plane that is nearly perpendicular to the line that connects the Earth and the Sun.

At the L1 Lagrange point, Aditya-L1 is carefully positioned to maintain a steady, uninterrupted view of the Sun.

At the L1 Lagrange point, Aditya-L1 is carefully positioned to maintain a steady, uninterrupted view of the Sun. The satellite can access solar radiation and magnetic storms from this position without being affected by the magnetic field or atmosphere of Earth. The gravitational stability of the L1 point also reduces the frequency of orbital maintenance activities, increasing the operational effectiveness of the satellite.

Fast facts: Aditya-L1 will continue to orbit the Earth at a distance of 1.5 million kilometres (1%) of the distance between the Earth and the Sun. The Sun is a huge sphere of gas, and Aditya-L1 would study the outer atmosphere. Aditya-L1 won’t land on the Sun or approach it any closer.

The first space-based Indian mission to study the Sun will be called Aditya L1. The spacecraft will be positioned in a halo orbit around the Sun-Earth system’s Lagrange point 1, or L1, which is located approximately 1.5 million kilometers from Earth.

The fundamental benefit of having a satellite in the halo orbit around the L1 point is the ability to continuously watch the Sun without any occultation or eclipses. We will have a greater chance to see the solar activity and how it influences the space weather in real time as a result of this. Seven instruments on board the spacecraft explore the photosphere, chromosphere, and the Sun’s outermost layers (the corona) using electromagnetic, particle, and magnetic field detectors.


The remaining four payloads take advantage of the special vantage point L1 to directly see the Sun while the remaining three payloads conduct in-situ particle and field research at the Lagrange point L1.

This makes it possible to conduct extensive scientific investigation on how solar dynamics spread throughout the interplanetary medium. Understanding the problem of coronal heating, coronal mass ejection, pre-flare and flare activities and their characteristics, dynamics of space weather, propagation of particle and fields, and other related topics, etc., the most significant data is anticipated to be provided by the Aditya L1 payloads.

Important Events:-  

02 September 2023 

India’s first solar observatory has begun ascending to the Sun-Earth L1 point. 

The satellite has been precisely positioned into the intended orbit by the vehicle. 

Aditya-L1 was successfully launched by PSLV-C57.

03 September 2023 

The next manoeuvre (EBN#2) is slated to take place on September 5, 2023, about 03:30. IST 

From ISTRAC in Bengaluru, the first Earth-bound manoeuvre (EBN#1) is successfully carried out. The new orbit is 245 by 22459 kilometres. 

The satellite is in good condition and performing normally. 

05 September 2023 

EBN#2’s second Earth-bound manoeuvre is executed successfully. The new orbit is 282 km by 40225 km in size. 

10 September 2023 

The third Earth-bound manoeuvre (EBN#3) is successfully carried out. The new orbit is 296 by 71767 kilometres.

The main scientific objectives of the Aditya-L1 mission are as follows:

  • Research on the dynamics of the solar upper atmosphere (chromosphere and corona).
  • Study of flares, the beginning of coronal mass ejections, the physics of partially ionized plasma, and coronal and chromospheric heating.
  • Keep an eye on the in-situ particle and plasma environment, which can be used to gather information about particle dynamics from the Sun.
  • The solar corona’s physics and heating process.
  • Thermodynamic evaluations of the coronal and coronal loop plasma: velocity, density, and temperature.
  • The evolution, behavior, and source of CMEs.
  • Recognize the series of events that take place at various layers (chromosphere, base, and extended corona) and ultimately result in solar eruptive events.
  • Magnetic field measurements in the solar corona and magnetic field topology.
  • Space weather triggers (solar wind dynamics, composition, and origin)



The sun may be studied in more detail than other stars since it is the closest one. We can learn a lot more about stars in our Milky Way galaxy and other galaxies by observing the sun. The sun is a very active star that extends far beyond our field of vision. It has a variety of eruptive characteristics and releases a tremendous amount of energy throughout the solar system. Such violent solar occurrences could generate a variety of perturbations in the space environment close to the earth if they are directed at the planet.

Due to the vulnerability of numerous spacecraft and communication systems to these interruptions, early notice of such events is essential for taking protective action. In addition to these risks, an astronaut would be in danger if they were exposed directly to such explosive events. There are numerous powerful thermal and magnetic phenomena on the sun. Because of this, the sun acts as a helpful natural laboratory for comprehending processes that cannot be directly examined in a lab.

To know more about Aditya-L1, Click here.

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