The Suprathermal Ion Composition Spectrometer (STICS) is a Time of Flight (TOF) Plasma Mass Spectrometer, capable of identifying Mass and Mass per Charge for incident Ions up to 200 keV/q. It uses an Electrostatic Analyzer to admit Ions of a particular Energy per Charge (E/Q) into the TOF Chamber. The E/Q Voltage is stepped through 32 Values, sitting at each Value for approximately 24 s, to measure Ions over the full E/Q Range of 6 keV/q to 200 keV/q. Ions then pass through a Carbon Foil and TOF Chamber, before finally impacting on a Solid-State Detector (SSD) for Energy Measurement. STICS combines these three Measurements of E/Q, TOF and Residual Energy, producing PHA Words. This Triple-Coincidence Technique greatly improves the Signal to Noise Ratio in the Data. Measurements of E/Q and TOF without Residual Energy also produce PHA Words. These Double-Coincidence Measurements are characterized by better Statistics since Ions whose Energy does not allow them to be registered by the SSD can still be counted in Double-Coincidence Measurements. However, Ion Identification in Double-Coincidence Measurements are limited to a select Number of Ions that are well separated in E/Q - TOF Space. The STICS Instrument provides full 3D Velocity Distribution Functions, through a Combination of multiple Telescopes and Spacecraft Spin. The Instrument includes three separate TOF Telescopes that view three separate Latitude Sectors, as shown in Figure 1. In addition, the WIND Spacecraft Spins, allowing the three Telescopes to trace out a nearly 4π sr Viewing Area. The Longitudinal Sectors are shown in Figure 2. The Solar Direction is in Sectors 8-10 while the Earthward Direction is in Sectors 0-2.
Version:2.3.0
The Suprathermal Ion Composition Spectrometer (STICS) is a Time of Flight (TOF) Plasma Mass Spectrometer, capable of identifying Mass and Mass per Charge for incident Ions up to 200 keV/q. It uses an Electrostatic Analyzer to admit Ions of a particular Energy per Charge (E/Q) into the TOF Chamber. The E/Q Voltage is stepped through 32 Values, sitting at each Value for approximately 24 s, to measure Ions over the full E/Q Range of 6 keV/q to 200 keV/q. Ions then pass through a Carbon Foil and TOF Chamber, before finally impacting on a Solid-State Detector (SSD) for Energy Measurement. STICS combines these three Measurements of E/Q, TOF and Residual Energy, producing PHA Words. This Triple-Coincidence Technique greatly improves the Signal to Noise Ratio in the Data. Measurements of E/Q and TOF without Residual Energy also produce PHA Words. These Double-Coincidence Measurements are characterized by better Statistics since Ions whose Energy does not allow them to be registered by the SSD can still be counted in Double-Coincidence Measurements. However, Ion Identification in Double-Coincidence Measurements are limited to a select Number of Ions that are well separated in E/Q - TOF Space. The STICS Instrument provides full 3D Velocity Distribution Functions, through a Combination of multiple Telescopes and Spacecraft Spin. The Instrument includes three separate TOF Telescopes that view three separate Latitude Sectors, as shown in Figure 1. In addition, the WIND Spacecraft Spins, allowing the three Telescopes to trace out a nearly 4π sr Viewing Area. The Longitudinal Sectors are shown in Figure 2. The Solar Direction is in Sectors 8-10 while the Earthward Direction is in Sectors 0-2.
| Role | Person | |
|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/George.Gloeckler |
| 2. | MetadataContact | spase://SMWG/Person/Robert.M.Candey |
| 3. | MetadataContact | spase://SMWG/Person/Lee.Frost.Bargatze |
SMS (SWICS/MASS/STICS) Instrument Suite, Home Page, University of Maryland
SMS (SWICS/MASS/STICS) Instrument Suite, Web Page for Monthly and Daily Browse Plots for SWICS up to February 1998 and STICS up to November 1998, University of Maryland
Access to Data in CDF Format via ftp from SPDF
Access to Data in CDF Format via http from SPDF
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb
Epoch Time at the Start of the Averaging Interval
Energy over Charge, EOQ
Ion Species, HE2+
Distribution Function, Phase Space Density Value, HE2+.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Column 2 Labels from TELESCOPE_INDEX: [ 1, 2, 3].
Column 3 Labels from STEP_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 13, 14, 15, 16, 17, 28, 29, 30, 31, 32].
Distribution Function, Phase Space Density Value, HE2+, Telescope 1, Plasmagram Display Type.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, HE2+, Telescope 1, at 5 Sectors as Spectrograms by Step.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, HE2+, Telescope 1, at 9 Steps as Spectrograms by Sector.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, Phase Space Density Value, HE2+, Telescope 2, Plasmagram Display Type.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, HE2+, Telescope 2, at 5 Sectors as Spectrograms by Step.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, HE2+, Telescope 2, at 9 Steps as Spectrograms by Sector.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, Phase Space Density Value, HE2+, Telescope 3, Plasmagram Display Type.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, HE2+, Telescope 3, at 5 Sectors as Spectrograms by Step.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Distribution Function, HE2+, Telescope 3, at 9 Steps as Spectrograms by Sector.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Error in Velocity Distribution Function Value, HE2+.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Column 2 Labels from TELESCOPE_INDEX: [ 1, 2, 3].
Column 3 Labels from STEP_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 13, 14, 15, 16, 17, 28, 29, 30, 31, 32].
Counts, Phase Space Density Value, HE2+.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Column 2 Labels from TELESCOPE_INDEX: [ 1, 2, 3].
Column 3 Labels from STEP_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 13, 14, 15, 16, 17, 28, 29, 30, 31, 32].
Error in Counts estimated assuming Poisson Statistics, HE2+. The Error is equal to the Square Root of the Number of Counts.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Column 2 Labels from TELESCOPE_INDEX: [ 1, 2, 3].
Column 3 Labels from STEP_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 13, 14, 15, 16, 17, 28, 29, 30, 31, 32].
Differential Flux, dJ/dE, HE2+.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Column 2 Labels from TELESCOPE_INDEX: [ 1, 2, 3].
Column 3 Labels from STEP_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 13, 14, 15, 16, 17, 28, 29, 30, 31, 32].
Differential Flux, dJ/dE, HE2+, Telescope 1, Plasmagram Display Type.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 1, at 5 Sectors as Spectrograms by Step.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 1, at 9 Steps as Spectrograms by Sector.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 2, Plasmagram Display Type.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 2, at 5 Sectors as Spectrograms by Step.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 2, at 9 Steps as Spectrograms by Sector.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 3, Plasmagram Display Type.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 3, at 5 Sectors as Spectrograms by Step.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, HE2+, Telescope 3, at 9 Steps as Spectrograms by Sector.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
Differential Flux, dJ/dE, Error, HE2+.
Column 1 Labels from SECTOR_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16].
Column 2 Labels from TELESCOPE_INDEX: [ 1, 2, 3].
Column 3 Labels from STEP_INDEX: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 13, 14, 15, 16, 17, 28, 29, 30, 31, 32].
Delta Time, HE2+
Sector Index
Telescope Index
Step Index