NSSDCA ID: SPIO-00207
Availability: At NSSDC, Ready for Electronic Access
This data set consists of ISIS 2 ionograms that have been obtained through a SPDS-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 full resolution ionograms and the average-resolution ionograms (averages of each 4 successive 40 kHz 8-bit values) both in the PI-provided (OSII) binary format. Also included are 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-2 instruments. In addition the average ionograms are available in CDF format. 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 resoration 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 and their location on a worldmap is shown in
http://nssdc.gsfc.nasa.gov/space/isis/isis_station_lar.GIF
ISIS-2 also had onboard recording capabilities but the tape recorder failed on February 4, 1972.
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 |