Helmet streamer
Videos
Helmet streamers, also known as coronal streamers, are elongated cusp-like structures in the Sun's corona which are often visible in white-light coronagraphs and during solar eclipses. They are closed
Helmet streamers appear bright in white-light relative to the surrounding coronal plasma.
Solar minimum
Solar maximum
Solar eclipse, Miles Landing 8 21 17
Solar corona
Videos
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.