2.7.1 spase://NASA/NumericalData/TRACERS/TRACERS2/Level2/AnalyzerCuspIons/IPD/Variable NASA NumericalData TRACERS 2 Analyzer for Cusp Ions (ACI) Ion Particle Distribution, Level 2 (L2), Data ts2_l2_aci_ipd DOI_DOI yyyy-mm-ddT00:00:00Z 2026-05-07T19:40:10.724Z Only known prior ReleaseDate of the metadata The Analyzers for Cusp Ions (ACIs) on the TRACERS mission measure ion velocity distribution functions in the magnetospheric cusp from two closely spaced spacecraft in low Earth orbit. The precipitating and upflowing ion measurements contribute to the overarching goal of the TRACERS mission. ACI is a toroidal top-hat electrostatic analyzer on a spinning platform that provides full angular coverage with instantaneous 22.5 degrees x approximately 6 degrees angular resolution for a single energy step. ACI has an ion energy range from approximately 8 eV/e to 20,000 eV/e covered in 47 logarithmic-spaced energy steps with fractional energy resolution of approximately 10%. It provides reasonably high cadence (312 ms) measurements of the ion energy-pitch angle distribution with good sensitivity and energy resolution, enabling detection of cusp boundaries and characterization of cusp ion steps. Please Acknowlege the TRACRES TEAM, for rules of use https:/tracers.physics.uiowa.edu/rules-use Fuselier, Stephen, A.; Miles, David, M. yyyy-mm-ddT00:00:00Z Space Physics Data Facility spase://SMWG/Person/Stephen.A.Fuselier InstrumentLead CoInvestigator spase://SMWG/Person/David.M.Miles PrincipalInvestigator spase://SMWG/Person/TRACERS_SOC HostContact spase://SMWG/Person/Lan.Jian MetadataContact spase://SMWG/Person/Scott.Boardsen MetadataContact Instrument Paper for Analyzer of Cusp Ions (ACI) https://doi.org/10.1007/s11214-025-01154-w Ion measurements from 8 to 28k eV, 47 logarithmic-spaced energy steps, angular resolution of 22.5x6 degrees, cadence of 312 ms in ROI, and in BOR only 1 out 128 energy sweeps are saved so cadence of ~ 40 s. spase://placeholder/NoPriorID spase://SMWG/Repository/TRACERS_PDP Online Open HTTPS from the TRACERS SDC https://tracers.physics.uiowa.edu/l2-public-data-products In CDF via http from the TRACERS Science Data Center CDF None Please Acknowlege the TRACRES TEAM, for rules of use https:/tracers.physics.uiowa.edu/rules-use spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/tracers/tracers2/aci_cusp-ions/l2/ipd_ion-dist/ In CDF via ftp from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/tracers/tracers2/aci_cusp-ions/l2/ipd_ion-dist/ In CDF via http from SPDF CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=TS2_L2_ACI_IPD&index=sp_phys ts2_l2_aci_ipd Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb CDF None Please Acknowlege the TRACRES TEAM, for rules of use https:/tracers.physics.uiowa.edu/rules-use spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi ts2_l2_aci_ipd Web Service to this product using the HAPI interface CSV Please Acknowlege the TRACRES TEAM, for rules of use https:/tracers.physics.uiowa.edu/rules-use Calibrated spase://NASA/Instrument/TRACERS/AnalyzerCuspIons EnergeticParticles 2025-08-13T20:59:59.000 -P6M PT99999.999S Earth.Magnetosphere Earth.NearSurface.Ionosphere Earth.NearSurface.Ionosphere.Topside Earth.NearSurface.AuroralRegion Earth.NearSurface.PolarCap Currently No Cavets Identified