China Exclusive: China will record 40-minute image of total solar eclipse corona

Chinese scientists are striving to capture a 40-minute sequence of images of the corona of a solar eclipse along its path across China on Wednesday in a bid to understand the sun's outer atmosphere. Chinese scientists have set up 17 observer stations along the central line of the solar eclipse in China to capture the corona images. They are very likely to get the first-hand materials for the solar corona research. The 17 stations were set up in the solar eclipse path from southwestern Yunnan Province to eastern coastal Zhejiang Province, which runs through 2,500 km across China.

The corona is the sun's outermost atmosphere, which is relatively dim, and can only be observed through a coronagraph on a normal day. A coronograph is an instrument that is designed to block light from the main solar surface in order to observe the corona. However, it can be easily seen during a total solar eclipse, as the brighter parts of the solar atmosphere are shadowed.

The corona could have a tremendous influence on the Earth, but it remains a puzzle. It has become an interesting research focus for astronomers around the world. Scientists have observed that when a solar wind erupts across the surface of the sun, a result of the coronal mass ejections (CMEs) or eruptions of material from the sun, communication signals on the Earth could be disturbed.

The total solar eclipse on Wednesday has been forecast by the CAS to be the longest observable in China between 1814 and 2309. Viewed from the best observation spots, the total eclipse can last more than six minutes.

Astronomers from all over the world are heading to China to observe the corona.