| Term: | RTN |
| Definition: |
Radial Tangential Normal. Typically centeredat a spacecraft. Used for IMF and plasma V vectors. The X axis (radial) isset as the primary axis, and is defined as the axis pointing from thespacecraft to the Sun. The Z axis (tangential) is set as the secondary axis,and is defined as that portion of the solar North rotational axis which isperpendicular to the primary axis. The Y axis (normal) is defined as Z crossX. |