Udaipur Solar Observatory (USO) Built In: 1976

The Udaipur Solar Observatory is on an island in Fateh Sagar Lake.

For solar observations the conditions of the sky are favorable.

As it is situated between water, the air turbulence which occurs due to ground heating by the sun’s rays is decreased.

This increases the quality of the image.

Average is around 1-2 arc seconds.

The solar observatory was built in 1976 by Dr. Arvind Bhatnagar.

Arvind Bhatnagar has made significant contributions in Solar Astronomy.

He was the founder and the director of USO.


Prof. Arvind Bhatnagar was known internationally for his significant contributions.

He obtained his Ph.D. degree in Solar Physics in 1964 from Agra University while working at the Kodaikanal Observatory under the guidance of Prof. M K. Vainu Bappu.

Prof. Arvind Bhatnagar died on the evening of 18 May 2006 at Udaipur.


The Observatory comprises a wide range of telescope.

The observatory is adding a new instrument by the name of ‘Solar Vector Magnetograph’ to its store-house.

This instrument will play an important role in the future research program by determining the magnetic field of the active regions.

The observatory has seen an entire solar cycle in the years of its subsistence.

Now, it is witnessing the next solar cycle.

Since 1981, USO has been managed by the Physical Research Laboratory, Ahmedabad, for the Department of Space, Government of India.

If you are planning to visit this observatory, you have to take a boat ride to reach the observatory.


Udaipur has so much to visit.

It’s not just about tourism and culture it’s much more.

Some information by ISRO

The back-end instruments of MAST, developed in-house at USO, include an adaptive optics system and a narrow band imaging polarimeter using a tandem Fabry-Perot etalon pair and LCVR polarimetric module.

Another instrument, viz., a spectropolarimeter, has been developed at ISRO Satellite Centre and will be soon deployed at MAST.

MAST will be used to measure vector magnetic fields of active regions at different heights of the solar atmosphere.

It will also be used to study seismic effects of solar flares. Some test images taken during the trial runs of MAST are shown in Figures, which include images taken with H-alpha and G-band filters.