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The larger one, known as the Coronagraph spacecraft, will explore the Sun’s corona, or outer atmosphere, while the smaller spacecraft Occulter will take a voyage through the same region with special navigation sensors and low-impulse thrusters that will allow the Coronagraph to do its job.

India’s coronagraph, Prof Ramesh says, has a slight advantage over the coronagraph in Nasa-ESA's joint Solar and Heliospheric Observatory.

The coronagraph on Nasa-ESA's mission, he says, is bigger which means it hides not only the photosphere but also parts of corona - so it cannot see the genesis of a CME if it originates in the hidden region.

It will also carry the first operational compact coronagraph that will help detect space weather for early warnings of disruptions to power grids, communications and navigation systems.

One of the key instruments the US will provide for both missions is a coronagraph, a device that blocks out the glare of the full Sun to allow processes taking place near the solar surface to be seen more easily.