India to build world's largest solar telescope

Bangalore: India is inching closer towards building the world's largest solar telescope in Ladakh on the foothills of the Himalayas that aims to study the sun's microscopic structure.

The National Large Solar Telescope (NLST) project has gathered momentum with a global tender floated for technical and financial bidding by the Bangalore-based Indian Institute of Astrophysics (IIA).

The tender that was floated last week calls for expression of interest (EoI) to design, manufacture and install the two-metre class solar telescope at a cost of Rs1.5 billion (around Dh113.8 million).

"The solar telescope will help study the microscopic structure of the sun and derive specific observations that are speculative in nature," IIA director Siraj Hasan said.

Solar telescopes are special-purpose scientific instruments used to study the sun. They are among the biggest fixed telescopes and are equipped with an optical flat mirror system to track the sun rays and direct them on to the telescope.

The sun is the star at the centre of the solar system. Three quarters of the sun's mass consists of hydrogen and the rest is helium. Less than two per cent consists of heavier elements, including oxygen, carbon, neon and iron.

The unique project involves other scientific organisations such as the state-run Indian Space Research Organisation (ISRO), Aryabhatta Research Institute of Observational-Sciences, Tata Institute of Fundamental Research and Inter-University Centre. The IIA will be the nodal agency.

October meeting

"The pre-technical discussion meeting will be held in October," Hasan said.

Though the 10-metre optical telescope at Mauna Kea in Hawaii is the largest, the Indian instrument will be the largest among solar telescopes.

Currently, the world's largest solar telescope is the McMath-Pierce Solar Telescope, with a diameter of 1.6 metres in Kitt Peak National Observatory at Arizona in the United States.

"The larger the diameter and larger the surface available to absorb sunlight, the more rays can be collected per second, enabling researchers to collect data with greater clarity and obtain accurate results," Hasan noted.