The images were derived from full disk scans by CDS on 23 April 1998. As the temperature increases, the radiation comes from higher layers of the solar atmosphere, or corona, and is more strongly associated with solar activity. At the very highest temperatures, only the hot loops above active regions are visible. Scientists use images like these to probe the temperature structure of the solar atmosphere.
 
 
 













A View of the Chromosphere & Corona
 
 
 

A view of the photosphere, chromosphere and corona over-layed.
 

A whole Sun movie sequence in three Fe lines ranging in temperature from 1 to 2 million degrees.

A time-line of the corona over a few days in 1998 and from 1996 to 1998.