Trace (disambiguation)

Transition Region and Coronal Explorer (TRACE) was a NASA heliophysics and solar observatory designed to investigate the connections between fine-scale magnetic fields and the associated plasma structures on the Sun by providing high resolution images and observation of the solar photosphere and transition region to the corona. A main focus of the TRACE instrument is the fine structure of coronal loops low in the solar atmosphere. TRACE is the fourth spacecraft in the Small Explorer program, launched on April 2, 1998, and obtaining its last science image in 2010.

Trace may refer to:

• Trace (linear algebra), the sum of the elements on the main diagonal of a square matrix or a linear transformation
  • Field trace, a particular trace in field theory
• Trace class, a certain set of operators in a Hilbert space
• Trace operator, a restriction-to-boundary operator in a Sobolev space