The SEP Instrument Suite on STEREO

SIT	HET and LET, on SEP-Central	SEPT-E and SEPT-NS

The Solar Terrestrial Relations Observatory (STEREO) will employ two nearly identical observatories in orbit about the Sun (one moving ahead of the Earth, and one moving behind) to provide the first-ever 3-D images of coronal mass ejections (CMEs). These stereo images will be supplemented by multi-point in situ measurements of solar wind and CME plasma and the energetic particles accelerated in association with solar eruptions, and by multipoint observations of radio bursts occurring in these events.

The Solar Energetic Particle (SEP) instrument suite provides four solar energetic particle instruments for the IMPACT (In-Situ Measurements of Particles and CME Transients) investigation on STEREO. IMPACT provides measurements of solar wind and suprathermal electrons, interplanetary magnetic fields, and solar energetic particles. The SEP suite is composed of the following elements:

• High Energy Telescope (HET)
• Low Energy Telescope (LET)
• Solar Electron Proton Telescope (SEPT)
• Suprathermal Ion Telescope (SIT)
• SEP-Central - the central command/control and data acquisition unit for the suite

Other related STEREO web sites:

• STEREO Home Page at GSFC
• STEREO on NASA Portal
• STEREO - IMPACT Home Page
• STEREO Science Center