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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."}]},{"HTTP_LINK":[{"0":"https://tracers.space.swri.edu"}]},{"Data_type":[{"0":"l2_aci"}]},{"Descriptor":[{"0":"ACI>Analyzer for Cusp Ions"}]},{"Logical_source":[{"0":"ts2_l2_aci_ipd"}]},{"Logical_source_description":[{"0":"TRACERS Satellite 2 Analyzer for Cusp Ions Level l2> IPD"}]},{"File_naming_convention":[{"0":"ts2_aci_l2_ipd_yyyyMMdd_v1.0.0"}]},{"DOI":[{"0":"https://doi.org/10.1007/s11214-025-01154-w"}]},{"LINK_TEXT":[{"0":"Level l2 IPD"}]},{"LINK_TITLE":[{"0":"Level l2 IPD"}]},{"Software_name":[{"0":"ACI Processing Software"}]},{"Software_version":[{"0":" "}]},{"MODS":[{"0":" "}]},{"Parents":[{"0":" "}]},{"Generation_date":[{"0":" "}]},{"Data_version":[{"0":" "}]},{"Logical_file_id":[{"0":" "}]}],"CDFVariables":[{"epoch_delta_plus":[{"VarDescription":[{"DataType":"CDF_UINT2"},{"NumElements":1},{"NumDims":0},{"RecVariance":"NOVARY"},{"NumWrittenRecords":1},{"PadValue":65534},{"BlockingFactor":1}]},{"VarAttributes":[{"FIELDNAM":"Epoch Delta Plus"},{"VALIDMIN":0},{"VALIDMAX":312},{"UNITS":"ms"},{"FORMAT":"%d"},{"CATDESC":"Epoch Delta Plus"},{"VAR_TYPE":"support_data"},{"SI_CONVERSION":" > "},{"LABLAXIS":"delta"},{"SCALETYP":"linear"}]},{"VarData":[156]}]},{"epoch_delta_minus":[{"VarDescription":[{"DataType":"CDF_UINT2"},{"NumElements":1},{"NumDims":0},{"RecVariance":"NOVARY"},{"NumWrittenRecords":1},{"PadValue":65534},{"BlockingFactor":1}]},{"VarAttributes":[{"FIELDNAM":"Epoch Delta Minus"},{"VALIDMIN":0},{"VALIDMAX":312},{"UNITS":"ms"},{"FORMAT":"%d"},{"CATDESC":"Epoch Delta Minus"},{"VAR_TYPE":"support_data"},{"SI_CONVERSION":" > "},{"LABLAXIS":"delta"},{"SCALETYP":"linear"}]},{"VarData":[156]}]},{"ts2_l2_aci_tscs_anode_angle":[{"VarDescription":[{"DataType":"CDF_FLOAT"},{"NumElements":1},{"NumDims":1},{"DimSizes":[16]},{"RecVariance":"NOVARY"},{"DimVariances":["VARY"]},{"NumWrittenRecords":1},{"PadValue":-1.0E+30},{"BlockingFactor":1}]},{"VarAttributes":[{"FIELDNAM":"Anode Look Direction"},{"VALIDMIN":-90.0},{"VALIDMAX":247.5},{"UNITS":"degrees"},{"FORMAT":"%f"},{"CATDESC":"ACI anode angles from +Z-axis in TSCS frame"},{"VAR_TYPE":"support_data"},{"SI_CONVERSION":" > "},{"LABLAXIS":"Anode Look Direction"},{"SCALETYP":"linear"},{"FILLVAL":-1.0E+31},{"VAR_NOTES":"Array of angles giving the direction (in themeasurement plane of the instrument) from the origin of theACI instrument towards the the center of each anode plate.Angles are positive from TSCS +Z axis towards the TSCS -Yaxis. 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