Rising Temperatures Near The Photosphere

Rising Temperatures Near The Photosphere

. The increases in temperature with height in a coronal streamer (top) and a coronal hole (bottom) have been inferred from data taken with the Soft X-ray Telescope on Yohkoh. Here the temperature is given in millions of degrees Kelvin, or MK, and the distance, r, from Sun center is specified in units of the Sunís radius. At a given height in the low corona, the temperature of coronal streamers is hotter than the temperature of coronal holes. Both regions seem to be fully heated by between 1.3 and 1.5 solar radii from Sun center. [Yohkoh is a project of international cooperation between ISAS and NASA.]

Copyright 2010, Professor Kenneth R. Lang, Tufts University