| Term: | transition region |
| Definition: |
Above the solar chromosphere and solar corona there is a transition region. The temperature here rises from 20000 to ~ 1-2 millions of K. Below the transition region, gravity dominates the shape of most features, so that the Sun may be described in terms of layers and horizontal features (like sunspots); above the transition region, dynamic forces dominate the shape of most features, so that the transition region itself is not a well- defined layer at a particular altitude. |