Aditya L1 - India's First Solar Mission

Aditya L-1 Mission is India’s first solar mission planned by the Indian Space Research Organisation (ISRO). Earlier the name was Aditya -1, which has been renamed as Aditya L-1 Mission.

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What is the Objective of Aditya L-1 Mission?

The objective of Aditya L-1 mission is to study Sun’s Corona, Chromosphere and Photosphere. In addition, it will study the particle flux emanating from Sun, and the variation of magnetic field strength.

Why did ISRO Rename Aditya -1 Mission as Aditya L-1 Mission?

Aditya-1 mission was planned for observing only the Corona of Sun. The reason behind Corona getting heated to very high temperatures is still a mystery in Solar Physics. Aditya -1 mission involved placing the satellite in 800 Km low earth orbit. Later ISRO planned to place the satellite in the halo orbit around the Lagrangian Point (L1). L1 is 1.5 Million Km from the Earth.  This point provides the advantage of observing the Sun continuously without any disturbance.  Hence the mission was renamed as Aditya L-1 mission.

Which is the Launch Vehicle that will be Used to Launch Aditya L-1 Mission?

The satellite will be launched by PSLV-XL launch vehicle from Sriharikota.

Quick Facts about Aditya L1 for UPSC

The important details about Aditya L1 are mentioned in brief in the table below:

When was the Aditya L1 mission originally announced? In 2008, ISRO announced it by the name Aditya-1
What is the significance of the Aditya L1 mission? It is India’s first solar mission aimed to study Sun’s Corona
What is the Visible Emission Line Coronagraph (VELC)? It is an internally occluded solar coronagraph capable of simultaneous imaging, spectroscopy, and spectro-polarimetry close to the solar limb. 
Why was Aditya-1 mission changed to Aditya L1? Earlier, the mission aimed to be launched 800 km LEO however, realizing that Halo Orbit around L1 will be more advantageous to capture the sun’s corona, it was changed to be called Aditya L1
What is the weight of the Aditya L1 satellite? 400 Kg
What are the observations expected from Aditya L1? Observations on the following:

  • Sun’s photosphere (soft and solid X-rays)
  • Chromosphere (UV) and 
  • Corona (visual and NIR) 

Relevant Links

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