NSSDCA ID: SPIO-00208
Availability: At NSSDC, Ready for Electronic Access
Time span: 1971-04-01 to 1984-01-31
These data are available in CDF format for plotting and downloading on CDAWeb
http://cdaweb.gsfc.nasa.gov/cdaweb/sp_phys/This data set consists of ISIS 2 ionograms that have been obtained through an AISRP-funded data restoration project. The ISIS ionograms (consisting of a fixed-frequency and a swept-frequency part) were digitized from the original ISIS telemetry tapes. Detailed information about the project can be found at
http://nssdc.gsfc.nasa.gov/space/isis/isis-status.html
The digitized sounder data (consisting of 8-bit receiver-amplitude values collected at a 40 kHz rate) contain the time and the frequency associated with each sounder pulse. The frequency of each sounder pulse is determined from a 3rd degree interpolation between the times of the frequency markers as identified in the sounder video during the A/D operation. Included in this data set are the average-resolution ionograms (averages of each 4 successive 40 kHz 8-bit values) in CDF format. Software to read and display the individual CDF files is available at
https://spdf.gsfc.nasa.gov/pub/data/isis/software/
These CDF files were produced at NSSDC from the original PI-provided ionogram data. Other ionogram data sets available at NSSDC include the full resolution ionograms and average ionograms both in the PI-provided (OS2) binary format, ASCII header files with pass-specific information and the PCM data which contain header, time, AGC, frequency-marker information and telemetry-level data from all other ISIS-1 instruments. The binary average ionograms and the ASCII header files are available online at
https://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/
ISIS 2 data are available to the extent permitted by telemetry station scheduling and the location of telemetry stations. The data selected for the ISIS data restoration effort include data from 24 telemetry stations. A list of stations can be found at
http://nssdc.gsfc.nasa.gov/space/isis/isis-table1-new.html
http://nssdc.gsfc.nasa.gov/space/isis/isis_station_lar.GIF
Questions and comments about this data collection can be directed to: Dr. Dieter K. Bilitza
Name | Role | Original Affiliation | |
---|---|---|---|
Dr. Robert F. Benson | General Contact | NASA Goddard Space Flight Center | rbenson@pop600.gsfc.nasa.gov |