spicules
at night
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.
At a total solar eclipse.
during a full solar eclipse
The photosphere, the chromosphere, and the corona
The sun's atmosphere, or the chromosphere and the corona, can be seen with the unaided eye only during a total solar eclips.
The thin red line around the sun during an eclipse is called a chromosphere.
Chromosphere
the chromosphere glows because of the release of hot, low density gases that are emitted from the sun. Normally, it can't be seen by the naked eye due to light from the photosphere blocking it. During a solar eclipse, the chromosphere is visible, appearing as a red ring around the Sun.
chromosphere
Chromosphere
Chromosphere and corona