ISIS/Alouette Topside Sounder Data Restoration Project

• Read about the project
  • background information
  • data selection criteria
  • analog-to-digital (A/D) operation
  • how to detect erroneous files
  • analysis of digital ionograms
  • description of the ISIS-2 sounder modes
  • the automatic topside ionogram scaler with true height algorithm TOPIST project: Annali Geophysica paper
• View and Retrieve ionograms in CDF format on SPDF's CDAWeb system
  Includes all ISIS-1 and -2 standard resolution ionograms in CDF format (skeleton_tables: ISIS-1, ISIS-2). First time users please read the separate Comments and Viewing Instructions.
• Retrieve binary data from NSSDC's anonymous ftp site:
  • Standard resolution ionogram data in OS2 binary
  • Header files with information for each satellite pass
  • Topside electron density profiles obtained with TOPIST
  • Electron density profiles obtained by manuel scaling in the seventies.
Also available on request:
• Binary full resolution ionograms with 3.75 km apparent-range resolution instead of 15 km for the standard ionograms [ISIS-1 and ISIS-2 format description]
• Telemetry-level Pulse Code Modulation data for all ISIS 2 instruments [PCM format description]
• Locate data for specified dates, times and other search criteria. Currently only ISIS-2 data are considered.
• Related software (retrieve source code):
  • Worldmap Fortran program for generating orbit parameters
  • Jackson's Fortran program to invert the ionogram trace into an electron density profile
  • an interactive tracing and inversion program using IDL (description of program)
• List of stations for which data are being restored. Location of these stations on a world map.
• Image Gallery
• Publications:
  • Extracts from a Spring AGU 1995 computer-interactive poster including the conversion of an ionogram trace to an electron density profile using a sample ionogram
    
  • Paper presented at 2001 Beacon Symposium and published in Annali Geofisica
  • Paper presented at 2003 Ionospheric Effects Symposium and published in Radio Science
  • Paper presented at 2003 International Reference Ionosphere Workshop and published in Advances in Space Research
  • Presentation at 2006 AISRP workshop
  • 2006 Status Slides for AISRP website.
  • Publications using data from this project

NASA Official: J. H. King, king@nssdca.gsfc.nasa.gov