The solar corona is the outermost layer of the Sun's atmosphere. It is a region filled with relatively hot, tenuous plasma that is structured by the solar magnetic field.
During a total solar eclipse, the Sun's corona and prominences are visible to the naked eye.
Temperatures in the solar atmosphere rise precipitously with height in the transition region between the chromosphere and corona.
The light visible close to the Sun during a total solar eclipse originates primarily from the K-corona.
The zodiacal light from sunlight scattered by interplanetary dust merges with the F-corona close to the Sun.
A nanoflare is a very small episodic heating event which could be prolific in the corona, the external atmosphere of the Sun. These would blend together to give the appearance of continuous heating.
Solar Magnetic Field Lines
Solar Flare and Coronal Mass Ejection (STEREO)