[ETL]

covering the intense sun lets the suns corona be seen.

Through the right type of telescope and filter you would even be able to see the Sun's magnetic field lines as rays projecting outward from the disk.

This image of the solar corona is a color overlay of the emission from highly ionized iron lines, with white light images added below. Different colors provide unique information about the temperature and composition of solar material in the corona.
Credits: S. Habbal/M. Druckmüller

A white light image of the solar corona during totality.
Credits: M. Druckmüller

Source: NASA.Gov

https://www.nasa.gov/feature/goddard/2016/preparing-for-the-august-2017-total-solar-eclipse

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From other sources...

[Delta 21]

The white light image doesnt do it justice but thats what it looked like. The shadow is so dark contrasting with the super bright corona. Perfectly sized objects perfectly positioned in space, making it possible for humans to stare at the sun! Vivid sharpness. Darkness during the day!

Yeah, it was pretty cool!