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 | 2026-04-20 |
| programCode |
[
"026:000"
]
|
| publisher |
{
"name": "NASA Space Physics Data Facility (SPDF) Data Services",
"@type": "org:Organization"
}
|
| theme |
[
"Heliophysics"
]
|
| title | ISIS 1 Topside Sounder Ionograms |
