The outermost atmospheric region of the Sunor a star, characterized by ionization temperatures above 10^5 K. The solarcorona starts at about 2100 km above the photosphere; there is no generallydefined
upper limit.
The sun's dynamic atmosphere is called the corona. It is filled with electrically charged particles, whose movements are governed by the tangle of magnetic fields surrounding the sun. While the sun's
surface is 6000K, the corona can reach up to millions of degrees, sparking questions from researchers on mechanisms heat the atmosphere so dramatically. Solar flares and coronal mass ejections originate in the corona.
The outermost atmospheric region of the Sun or a star,
characterized by ionization temperatures above 10^5 K.
The solar corona starts at about 2100 km above the
photosphere; there is no generally defi
ned upper limit.
A telescope, or attachment to a telescope, that blocks the light of a star (Sun) inside the instrument field of view so that regions near the star (Sun), particularly the atmosphere or solar corona, c
an be viewed
An optical device that makes it possible to observe the corona at times other than during an eclipse. A simple lens focuses the Sun onto an occulting disk that prevents the light from the solar disk f
rom proceeding farther along the optical path, effectively providing an artificial eclipse.
An instrument which can image things very close to the Sun by using a disk to block the Sun's bright surface which reveals the faint solar corona and other celestial objects. (spase)