2.7.1 spase://SMWG/Observatory/TRACERS Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites 2026-04-03T00:00:00Z TRACERS is a NASA mission led by the University of Iowa to answer long-standing questions key to understanding space weather, particularly how the Sun transfers energy, mass, and momentum to near-Earth space. TRACERS consists of two identical satellites that orbit Earth in tandem (one following the other). TRACERS & were launched on 2025 July 23, and are now in a ~590 km, Sun synchronous low Earth orbit. Each orbit takes about 90 minutes. Their separation in time along the orbit varies from 10 to 120s (75 to 900 km along track). spase://SMWG/Person/David.M.Miles PrincipalInvestigator spase://SMWG/Person/Lan.Jian MetadataContact spase://SMWG/Person/Scott.Boardsen MetadataContact Mission Web Pages https://tracers.physics.uiowa.edu/ Mission Web Page TRACERS mission paper https://doi.org/10.1007/s11214-025-01184-4 Gives the science objectives: descriptions of the spacecraft and instrumentation. TRACERS mission design https://doi.org/10.1007/s11214-025-01185-3 Mission design: Includes discussion on Region of Interest (ROI). Back orbit Science Opportunities https://doi.org/10.1007/s11214-026-01270-1 Discussion of back orbit and back orbit science. Science Operations Center https://doi.org/10.1007/s11214-025-01199-x Processing of L0 & L1 and SPICE kernels, ensure data quality and distribution of L2. Appendix has definitions of all coordinate systems used. SPDF readme file on TRACERS https://spdf.gsfc.nasa.gov/pub/data/tracers/00readme.html Rehashes above, include links to data and acronym lists. Earth.Magnetosphere Earth.NearSurface.Ionosphere Earth.NearSurface.Ionosphere.Topside Earth.NearSurface.AuroralRegion Earth.NearSurface.PolarCap