Contents

• Contents
• List of Figures
• List of Tables
• 1. Introduction
  • 1.1 Purpose
  • 1.2 Structure
  • 1.3 How to Contact Us
  • 1.4 SWS Publications
    • 1.4.1 Acknowledgements and guidelines
    • 1.4.2 Inventory of publications
• 2. Instrument overview
  • 2.1 General Introduction to SWS
  • 2.2 Instrument Design
  • 2.3 The Wavelength Range Covered
  • 2.4 Signal Detection
    • 2.4.1 Design of the signal chain
    • 2.4.2 Processes in the signal chain
• 3. Instrument Observing Modes
  • 3.1 Introduction
  • 3.2 AOT Overview
    • 3.2.1 Up-Down scans
    • 3.2.2 Reference scans
  • 3.3 SWS01 - Full Scan
  • 3.4 SWS02 - Line Scan
  • 3.5 SWS06 - Wavelength Range Scan
  • 3.6 SWS07 - Fabry-Pérot Scan
  • 3.7 SWS99 - Post-Helium or Calibration Observation
    • 3.7.1 The post-helium observation
    • 3.7.2 Calibration observation
  • 3.8 SWS90-SWS98 - Engineering Observation
• 4. Wavelength Calibration and Resolution
  • 4.1 Introduction
  • 4.2 Wavelength Models
    • 4.2.1 Grating
    • 4.2.2 Fabry-Pérot
  • 4.3 Wavelength Calibration Methodology
    • 4.3.1 Grating
    • 4.3.2 Fabry-Pérot
  • 4.4 Wavelength Calibration Accuracy
    • 4.4.1 Grating
    • 4.4.2 Fabry-Pérot
  • 4.5 Instrumental Profile and Resolution
    • 4.5.1 Grating
    • 4.5.2 Fabry-Pérot
• 5. Photometric Calibration
  • 5.1 Introduction
  • 5.2 Photometric Model
  • 5.3 Dark Current Subtraction
    • 5.3.1 Detector noise & dark current
    • 5.3.2 Dark current correction for band 2
  • 5.4 The Relative Spectral Response Function (RSRF)
    • 5.4.1 RSRF measurements before launch
    • 5.4.2 In-orbit verification of the ILT RSRF
    • 5.4.3 Spline smoothing of residues
    • 5.4.4 RSRF calibration sources
    • 5.4.5 Accuracy of the RSRFs
    • 5.4.6 Overview of the RSRF curves
    • 5.4.7 Fabry-Pérot RSRF
  • 5.5 Detector Response to the Internal Calibration Source
  • 5.6 Grating Flat-fielding
  • 5.7 Signal to Flux Conversion
    • 5.7.1 Astronomical Calibration Sources (ACS)
    • 5.7.2 Photometric calibration accuracy
  • 5.8 Surface Brightness Derivation
  • 5.9 The SWS Error Budget
    • 5.9.1 Sources of uncertainty
    • 5.9.2 The SWS photometric calibration error budget
    • 5.9.3 Reproducibility
    • 5.9.4 Overall error budget
• 6. Calibration of SWS after Liquid Helium Depletion
  • 6.1 Introduction
  • 6.2 Temperature Change of the ISO Focal Plane
  • 6.3 Wavelength Calibration and Spectral Resolution
  • 6.4 Detector Dark Currents
  • 6.5 Relative Spectral Response Change
  • 6.6 Absolute Flux Calibration
  • 6.7 Post-Helium Flux Calibration Sources
• 7. Standard Product Generation
  • 7.1 Introduction
  • 7.2 From ERD to SPD
    • 7.2.1 Reading the ERD
    • 7.2.2 Determination of the data range
    • 7.2.3 Subtraction of the `midbit' values
    • 7.2.4 Selection of valid samples
    • 7.2.5 Correction of the integration ramp for the RC time constant
    • 7.2.6 Correction for the reset pulse effects
    • 7.2.7 Removal of electrical cross-talk
    • 7.2.8 Glitch detection
    • 7.2.9 Extraction of the photo-currents and their uncertainties
    • 7.2.10 Conversion to voltages
    • 7.2.11 Assigning wavelengths
    • 7.2.12 Writing the data
  • 7.3 From SPD to AAR
    • 7.3.1 Reading data from the SPD
    • 7.3.2 Transient correction
    • 7.3.3 Subtraction of dark currents
    • 7.3.4 Responsivity calibration
    • 7.3.5 Flux calibration
    • 7.3.6 Velocity correction
    • 7.3.7 Output table files
  • 7.4 Error Propagation in the SWS Pipeline
    • 7.4.1 Basic formalism
    • 7.4.2 Slope error
    • 7.4.3 Offset error
    • 7.4.4 Gain error
  • 7.5 SWS Pipeline Software
    • 7.5.1 Implementation of the errors
    • 7.5.2 Decoding of error tags in the AAR
• 8. Beam Profiles, Pointing and Focal Plane Geometry
  • 8.1 Introduction
  • 8.2 Entrance Apertures and Detector Fields of View
    • 8.2.1 Entrance aperture optics
    • 8.2.2 Entrance apertures and spacecraft axis
  • 8.3 Determination of Focal Plane Geometry
    • 8.3.1 Detector fields of view
  • 8.4 The Beam Profile
    • 8.4.1 Calibration observations
    • 8.4.2 Results
  • 8.5 Straylight
  • 8.6 Pointing Effects
    • 8.6.1 Introduction
    • 8.6.2 Pointing effects on fringes
    • 8.6.3 Pointing jitter induced correlated noise
    • 8.6.4 Signal modulation on Dra
• 9. Caveats
  • 9.1 Introduction
  • 9.2 Memory Effects
    • 9.2.1 Band 2
    • 9.2.2 Memory effects in bands 4, 5 and 6
    • 9.2.3 Reference scan memory effects
    • 9.2.4 Glitch tails
  • 9.3 Detector Jumps
    • 9.3.1 Single detector jumps
    • 9.3.2 Scan jumps
  • 9.4 Aperture Size
  • 9.5 The Influence of CAM-CVF Operations on SWS
  • 9.6 Diffuse Background Emission
  • 9.7 Fringes and Baseline Ripples
• A. Product Description
  • A.1 Introduction
  • A.2 Raw Data Files
    • A.2.1 Edited Raw Data (ERD)
    • A.2.2 Compact Status History (CSH)
  • A.3 First Stage of the Pipeline
    • A.3.1 Standard Processed Data (SPD)
    • A.3.2 SWS Glitch History Data
  • A.4 Second Stage of the Pipeline
    • A.4.1 Auto-Analysis Results (AAR)
  • A.5 Calibration-G Files
    • A.5.1 SWS Cal-G 1 Electrical Cross-talk Matrices
    • A.5.2 SWS Cal-G 2 RC Correction Time scales
    • A.5.3 SWS Cal-G 2A `Midbit' Values
    • A.5.4 SWS Cal-G 2B Pulse-Shape Correction Values
    • A.5.5 SWS Cal-G 3 Reset Cutout Lengths
    • A.5.6 SWS Cal-G 4 Valid Data Range Limits
    • A.5.7 SWS Cal-G 5 Switchable Gains
    • A.5.8 SWS Cal-G 6 Glitch Reject Levels
    • A.5.9 SWS Cal-G 7 Noise Characteristics
    • A.5.10 SWS Cal-G 8 Grating Calibration Spectrum (high)
    • A.5.11 SWS Cal-G 8A Grating Calibration Spectrum (low)
    • A.5.12 SWS Cal-G 9 LVDT-Angle Relation
    • A.5.13 SWS Cal-G 10 Key Wavelengths
    • A.5.14 SWS Cal-G 11 FP Calibration Spectrum
    • A.5.15 SWS Cal-G 12 Gap-Position Relation
    • A.5.16 SWS Cal-G 13 Key Wavelengths
    • A.5.17 SWS Cal-G 14 Intensity of Calibration Sources
    • A.5.18 SWS Cal-G 15 Maximum Allowable Wavelength Shift
    • A.5.19 SWS Cal-G 16A Aperture Offsets
    • A.5.20 SWS Cal-G 16B Detector Offsets
    • A.5.21 SWS Cal-G 16C Grating Constants
    • A.5.22 SWS Cal-G 16D Telescope Area
    • A.5.23 SWS Cal-G 16E Scanner Curve Coefficients
    • A.5.24 SWS Cal-G 16ET Scanner Curve Coefficients
    • A.5.25 SWS Cal-G 18 Effective Gap Correction
    • A.5.26 SWS Cal-G 19 SWS01 Resolution Factors
    • A.5.27 SWS Cal-G 21_n Detector Dark Current/Noise for n sec Reset
    • A.5.28 SWS Cal-G 23 Wavelength Limits for Bands
    • A.5.29 SWS Cal-G 24 Wavelength Limits for Apertures
    • A.5.30 SWS Cal-G 25_xx Spectral Responsivity for Band xx
    • A.5.31 SWS Cal-G 35_xx Fine Beam Profile for Band xx
    • A.5.32 SWS Cal-G 36_xx Coarse Beam Profile for Band xx
    • A.5.33 SWS Cal-G 40 Scanner Stops
    • A.5.34 SWS Cal-G 41 Shape of Calibration Source
    • A.5.35 SWS Cal-G 42 Converting Signal to Flux
    • A.5.36 SWS Cal-G 43 Flat-Fielding
    • A.5.37 STIMEDEP Time Dependency File
• B. List of Calibration Concerns
• C. Uplink History
  • C.1 Summary of Uplink Changes
  • C.2 From Revolution 36 (Early in the PV Phase)
  • C.3 From Revolution 40
  • C.4 From Revolution 44
  • C.5 From Revolution 60
  • C.6 From Revolution 64 (Late in the PV Phase)
  • C.7 From Revolution 71 (End of PV Phase)
  • C.8 From Revolution 78^C.1
  • C.9 From Revolution 101
  • C.10 From Revolution 103
  • C.11 From Revolution 150
  • C.12 From Revolution 191
  • C.13 From Revolution 237
  • C.14 From Revolution 336
  • C.15 From Revolution 590
• D. List of Acronyms and Symbols
• E. Connections and Snapshots
  • E.1 Connections
  • E.2 A Snapshot in Time 1
  • E.3 A Snapshot in Time 2
• Bibliography
• Index