The Transition Region and Coronal Explorer (TRACE) is a NASA Small Explorer
(SMEX) mission to image the solar corona and transition region at high angular
and temporal resolution.
TRACE was launched ... on a Pegasus launch vehicle from Vandenberg Air Force Base
in April 1998. The launch was scheduled to allow joint observations with SOHO
during the rising phase of the solar cycle to sunspot maximum. No transition
region or coronal imager has witnessed the onset and rise of a solar cycle.
For more information, see: