Contents

• Contents
• 1. Introduction
  • 1.1 Purpose
  • 1.2 How to use this manual
  • 1.3 What's new
    • 1.3.1 Issue 1
  • 1.4 How to contact ESA or other institutes
  • 1.5 Relevant documents
• 2. Processing SWS Data
  • 2.1 Introduction
  • 2.2 Reading the data from CD-ROM
  • 2.3 Basic processing steps
  • 2.4 Having a quick-look at the data
  • 2.5 Selecting data
  • 2.6 Using Detector Redundancy
  • 2.7 Join AOT bands together
  • 2.8 Smoothing and Rebinning data
  • 2.9 Current Caveats on SWS Data Products
• 3. Instrument overview
  • 3.1 Introduction
  • 3.2 The Instrument
  • 3.3 Entrance Apertures
    • 3.3.1 Optics and detector fields of view
    • 3.3.2 Entrance apertures and spacecraft axis
    • 3.3.3 Beam Profile
  • 3.4 SWS Detectors and operation
• 4. AOT overview
  • 4.1 AOT Introduction
    • 4.1.1 ICS
  • 4.2 AOT 1
    • 4.2.1 Introduction
    • 4.2.2 AOT SWS01 sample time-line
    • 4.2.3 Example AOT 1 data
    • 4.2.4 AOT 1 Spectral Resolution
  • 4.3 AOT 2
    • 4.3.1 Example AOT 2 timeline
    • 4.3.2 Example AOT 2 data
  • 4.4 AOT 6
    • 4.4.1 Example AOT 6 timeline
    • 4.4.2 Example AOT 6 data
  • 4.5 AOT 7
    • 4.5.1 Example AOT 7 timeline
    • 4.5.2 Example AOT 7 data
  • 4.6 AOT behaviour
    • 4.6.1 up-down scans
    • 4.6.2 Reference scans
    • 4.6.3 Recognising the start of an AOT
    • 4.6.4 Cross AOT Flux Comparisons
• 5. Instrumental Characteristics
  • 5.1 Introduction
  • 5.2 Grating Performance Overview
  • 5.3 Fabry-Pérot Overview
    • 5.3.1 Spectral Resolution
    • 5.3.2 Sensitivity
    • 5.3.3 Noise
    • 5.3.4 Saturation
    • 5.3.5 Leakage
    • 5.3.6 Tracking Noise
  • 5.4 Detector Noise & Dark Current
  • 5.5 Detector Response
  • 5.6 Behaviour around a reset
  • 5.7 Glitches
  • 5.8 Memory effects
  • 5.9 Reference Scan Memory Effects
  • 5.10 Effects of pointing accuracy
  • 5.11 Grating instrumental profile and resolution
  • 5.12 Single Detector Signal Jumps
  • 5.13 Light leakage in band 3D
  • 5.14 CAM CVF & SWS
  • 5.15 Diffuse Background Emission
• 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
  • 6.6 Spurious Narrow Spectral Features
    • 6.6.1 Spurious Spectral Features seen in Band 2C
  • 6.7 Overview of the RSRF curves
• 7. SWS Calibration
  • 7.1 Introduction
  • 7.2 Overall Calibration
  • 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 Correction of the integration ramp for the RC time constant
    • 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 Responsivity check
    • 8.3.6 Flux calibration
    • 8.3.7 Velocity Correction
    • 8.3.8 Extracting data from the SPD
    • 8.3.9 Sort the internal table in wavelength
    • 8.3.10 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
  • 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
    • 9.2.2 SWS Compact Status
  • 9.3 Standard processed (SPD) files
    • 9.3.1 SWS Standard Processed Data
    • 9.3.2 SWS Glitch History Data
  • 9.4 Auto-Analysis Results (AAR) files
    • 9.4.1 SWS Auto-Analysis Results
    • 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
• A. List of Acronyms and Symbols
• Index