ISIS 1 Topside Sounder Ionograms
These ionograms were digitized from the original ISIS-1 7-track analog telemetry tapes using the facilities of the former Data Evaluation Laboratory at the NASA/GSFC. This data restoration project is headed by Dr. R.F. Benson (NASA/GSFC). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.75 km. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution between ionograms is typically 29 seconds.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[ "026:00" ] |
| contactPoint |
{ "fn": "NASA Space Physics Data Facility", "@type": "vcard:Contact", "hasEmail": "mailto:NASA-SPDF-Support@nasa.onmicrosoft.com" } |
| description | These ionograms were digitized from the original ISIS-1 7-track analog telemetry tapes using the facilities of the former Data Evaluation Laboratory at the NASA/GSFC. This data restoration project is headed by Dr. R.F. Benson (NASA/GSFC). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.75 km. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution between ionograms is typically 29 seconds. |
| distribution |
[ { "@type": "dcat:Distribution", "format": "BIN", "mediaType": "application/octet-stream", "downloadURL": "https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1969-009A-01" }, { "@type": "dcat:Distribution", "format": "HTML", "mediaType": "text/html", "downloadURL": "https://nssdc.gsfc.nasa.gov/space/isis/isis-status.html" } ] |
| identifier | /SDE/SPASE_JSON/|82aa1971bbe95a07ef892eb3df5d4403 |
| keyword |
[ "akr", "ducted-echoes", "fai", "field-aligned-irregularities", "fixed-and-swept-frequency-sounder", "ground-echoes", "ground-reflections", "ionospheric-echoes", "ionospheric-reflections", "plasma-resonance", "plasma-waves", "solar-type-iii-bursts", "spectrum-ionogram", "topside-ionosphere", "topside-sounder", "upper-hybrid-noise-band", "wave-scattering", "waves-active" ] |
| license | https://www.usa.gov/government-works |
| modified | 2026-06-22 |
| programCode |
[ "026:000" ] |
| publisher |
{ "name": "NASA Space Physics Data Facility (SPDF) Data Services", "@type": "org:Organization" } |
| theme |
[ "Heliophysics" ] |
| title | ISIS 1 Topside Sounder Ionograms |
