Contents

• 1 Introduction
  • 1.1 Purpose
  • 1.2 How to use this manual
  • 1.3 What's new
    • 1.3.1 Issue 1
    • 1.3.2 Issue 1.1
    • 1.3.3 Issue 1.2
    • 1.3.4 Issue 2.0
    • 1.3.5 Issue 2.1
    • 1.3.6 Issue 3.0
    • 1.3.7 Issue 3.1
  • 1.4 CD Contents
  • 1.5 How to contact ESA or other institutes
  • 1.6 Relevant documents
• 2 Getting started with SWS Data
  • 2.1 Introduction
  • 2.2 Reading the data from CD-ROM and having a quick-look at the data
    • MIDAS
    • IDL
  • 2.3 Having a quick-look at the data
  • 2.4 Selecting data
  • 2.5 Re-bin onto equidistant wavelength grid
  • 2.6 Process up-down scans
  • 2.7 Join AOT bands together
  • 2.8 Smooth data
  • 2.9 Current Caveats on SWS Data Products
  • 2.10 Caveats applicable to OLP versions prior to V6.1
• 3 Instrument overview
  • 3.1 Introduction
  • 3.2 SWS
    • 3.2.1 The Instrument
    • 3.2.2 Entrance apertures and spacecraft axis
  • 3.3 Data Processing
• 4 AOT overview
  • 4.1 Introduction
    • 4.1.1 ICS
  • 4.2 AOT 1
    • 4.2.1 Introduction
    • 4.2.2 Example AOT 1 data
    • 4.2.3 AOT 1 Spectral Resolution
      • Theory
      • Observations
      • AOT 1 spectral resolution conclusions
  • 4.3 AOT 2
  • 4.4 AOT 6
  • 4.5 AOT 7
  • 4.6 AOT behaviour
    • 4.6.1 up-down scans
    • 4.6.2 Reference scans
    • 4.6.3 Recognising the start of an AOT
• 5 Instrumental Characteristics
  • 5.1 Introduction
  • 5.2 Detector Noise & Dark Current
  • 5.3 Behaviour around a reset
  • 5.4 Glitches
  • 5.5 Memory effects
  • 5.6 Reference Scan Memory Effects
    • 5.6.1 Background
    • 5.6.2 An example
    • 5.6.3 Affected observations
    • 5.6.4 Are you affected?
  • 5.7 Effects of pointing accuracy
    • 5.7.1 Introduction
    • 5.7.2 Pointing effects on flux accuracy
    • 5.7.3 Pointing effects on wavelength accuracy
    • 5.7.4 Effects seen in data induced by incorrect target coordinates or crowded fields
      • Effect
      • Reason
    • 5.7.5 Conclusions & Recommendations
  • 5.8 Grating instrumental profile and resolution
    • 5.8.1 Introduction
    • 5.8.2 Observations
    • 5.8.3 Preliminary IP Determination
    • 5.8.4 IP Determination
    • 5.8.5 Conclusions
  • 5.9 Single Detector Signal Jumps
    • 5.9.1 Introduction
    • 5.9.2 Data used in this test
    • 5.9.3 Characterization of the jumps at SPD level
    • 5.9.4 Characterization at ERD level
    • 5.9.5 Checking the association with glitches
    • 5.9.6 Conclusions & Recommendations
      • Conclusions
      • Recommendations
  • 5.10 CAM CVF & SWS
• 6 The RSRF and Effect of Fringes
  • 6.1 Introduction
  • 6.2 The RSRF calibration
  • 6.3 RSRF Calibration sources and model sources
  • 6.4 Differences between lab RSRF and in-orbit RSRF
  • 6.5 What can go wrong when dividing by the RSRF?
    • 6.5.1 Present quality of RSRFs
    • 6.5.2 Respcal after wrong dark subtraction
    • 6.5.3 Uncertainties of some line flux levels in weak sources
    • 6.5.4 Uncertainties of line flux levels in band 3
    • 6.5.5 Leakage in band 3D
    • 6.5.6 Spurious Spectral Features seen in Band 2C
      • Introduction
      • Data
      • Results
      • Discussion
      • Conclusions
  • 6.6 Overview of the RSRF curves
• 7 SWS Calibration
  • 7.1 Introduction
  • 7.2 Overall Calibration
    • Determination of focal plane geometry, array geometry and alignment
    • Determination of wavelength scales
    • Determination of photometric sensitivity
  • 7.3 Flux calibration
  • 7.4 Flux calibration accuracy
    • 7.4.1 General
    • 7.4.2 Grating
    • 7.4.3 FP
  • 7.5 Wavelength calibration
  • 7.6 Wavelength calibration accuracy
• 8 The Pipeline and its effects
  • 8.1 Introduction
  • 8.2 ERD to SPD (Derive-SPD)
    • 8.2.1 Read data of one reset interval
    • 8.2.2 Determine Data Range
    • 8.2.3 Subtract MIDBIT Values
    • 8.2.4 Correct for reset pulse effects
    • 8.2.5 Linearization of the measurement
    • 8.2.6 Removal of Electrical Cross-talk
    • 8.2.7 Deglitching
    • 8.2.8 Position computation
    • 8.2.9 Extraction of the photo-currents and their uncertainties
    • 8.2.10 Conversion of digitized read-out's to output voltages
    • 8.2.11 Fill flag word
    • 8.2.12 Get Grating angle
    • 8.2.13 Get Fabry-Pérot gap
    • 8.2.14 Assign wavelength for grating and FP
    • 8.2.15 Writing data out
  • 8.3 SPD to AAR (Auto-Analysis)
    • 8.3.1 Read all data from SPD
    • 8.3.2 Determine AOT and Velocity correction
    • 8.3.3 Correction for time dependent detector behaviour
    • 8.3.4 Subtraction of dark currents
    • 8.3.5 Reference scan calibration
    • 8.3.6 Combination of Up and Down scans
    • 8.3.7 Responsivity check
    • 8.3.8 Flux calibration
    • 8.3.9 Flat field
    • 8.3.10 Velocity Correction
    • 8.3.11 Extracting data from the SPD
    • 8.3.12 Sort the internal table in wavelength
    • 8.3.13 Output table files
  • 8.4 The Error Propagation of the SWS Pipeline
    • 8.4.1 Introduction
    • 8.4.2 DERIVE SPD
    • 8.4.3 DERIVE AAR
      • ANTIMEM : Remove memory effects
      • DARK : Dark Current subtraction
      • RESPCAL : Responsivity Calibration
      • FLUXCON : Flux Conversion
      • VELCOR : Velocity Correction
      • EXTRACT_AAR : AAR Extraction
  • 8.5 Glitch removal effects in fast speed AOT 1 observations
    • 8.5.1 Introduction
    • 8.5.2 Processing
    • 8.5.3 Results
    • 8.5.4 Conclusions
  • 8.6 Version history of the SPG pipeline
• 9 Product Description
  • 9.1 Introduction
  • 9.2 Raw data files (ERD and Compact Status)
    • 9.2.1 SWS Edited Raw Data
      • Headers
      • Records
    • 9.2.2 SWS Compact Status
      • Headers
      • Records
  • 9.3 Standard processed (SPD) files
    • 9.3.1 SWS Standard Processed Data
      • Headers
      • Records
    • 9.3.2 SWS Glitch History Data
      • Headers
      • Records
  • 9.4 Auto-Analysis Results (AAR) files
    • 9.4.1 SWS Auto-Analysis Results
      • Headers
      • Records
    • 9.4.2 SWAALINE and SWAASCNT
  • 9.5 Calibration-G files
    • 9.5.1 SWS Cal-G 1 Electrical crosstalk matrices
    • 9.5.2 SWS Cal-G 2 RC correction timescales
    • 9.5.3 SWS Cal-G 2A Midbit values
    • 9.5.4 SWS Cal-G 2B Shape correction values
    • 9.5.5 SWS Cal-G 3 Reset cutout lengths
    • 9.5.6 SWS Cal-G 4 Amplifier limits
    • 9.5.7 SWS Cal-G 5 Switchable gains
    • 9.5.8 SWS Cal-G 6 Glitch reject levels
    • 9.5.9 SWS Cal-G 7 Grating detector noise characteristics
    • 9.5.10 SWS Cal-G 8 Grating calibration specifications
    • 9.5.11 SWS Cal-G 9 LVDT-Angle relation
    • 9.5.12 SWS Cal-G 10 Key wavelengths
    • 9.5.13 SWS Cal-G 11 FP calibration spectrum
    • 9.5.14 SWS Cal-G 12 Gap-position relation
    • 9.5.15 SWS Cal-G 13 Relative flux
    • 9.5.16 SWS Cal-G 14 Intensity of internal calibration sources
    • 9.5.17 SWS Cal-G 15 Intensity of calibration sources
    • 9.5.18 SWS Cal-G 16A Aperture offsets
    • 9.5.19 SWS Cal-G 16B Element offsets
    • 9.5.20 SWS Cal-G 16C Grating constants
    • 9.5.21 SWS Cal-G 16D Telescope area
    • 9.5.22 SWS Cal-G 16E Scanner curve coefficients
    • 9.5.23 SWS Cal-G 18 Effective gap correction
    • 9.5.24 SWS Cal-G 19 AOT 1 resolution factors
    • 9.5.25 SWS Cal-G 20 Relative detector responsivity
    • 9.5.26 SWS Cal-G 21_x Detector dark current/noise for x sec reset
    • 9.5.27 SWS Cal-G 22 Detector response to internal diffuse source
    • 9.5.28 SWS Cal-G 23 Wave limits for bands
    • 9.5.29 SWS Cal-G 24 Wave limits for apertures
    • 9.5.30 SWS Cal-G 25_x Spectral responsivity for band x
• 10 Products sorted by AOT
  • 10.1 AOT 1, Low Resolution Full Grating Scan
  • 10.2 AOT 2, Grating Line Profile Scan
  • 10.3 AOT 6, Grating Scan
  • 10.4 AOT 7, Combined Fabry-Pérot Line Scan and SW Grating Scan
• Index