The farthest most outer part of the sun is the corona. It extends about 10-12 from the sun's next layer.
I guess you mean only during a total eclipse of the Sun. At that time we can see the chromosphere and the corona. The outermost layer is the corona.
Actually, you can only see the corona during an eclipse. The correct answer is the Photosphere.
The layer of the sun that is only visible in an eclipse is called the corona.
We can only see the sun's corona (the outer layer of its atmosphere) during a solar eclipse. During the regular day, the sun's photosphere (inner layer of its atmosphere) and cromosphere (middle layer of its atmosphere) are brighter than the corona so it can't be seen. People actually shouldn't even be looking at the sun directly to try and see the corona.
The photosphere is the layer we can see.
corona
photosphere
photosphere
The "photosphere".
The photosphere
The photosphere.
The name of the sun's surface layer is called the chromosphere. The other layers of the sun is called photosphere and convection zone.