Table · dataset · 2026
ISIS-2 Topside Sounder Average Ionogram over Santiago, Chile: SNT, Latitude -33, Longitude 298
Listed in NASA Data Portal
These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.
Description
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/s. This Sample Rate is higher than the Nyquist Frequency of 30 kHz. The Sample Frequency of 40 kHz provides a Measurement every 25 µs corresponding to an Apparent Range Interval equal to 3.75 km from c*t/2, where c is the Speed of Light.
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Ionograms with this Sample Rate are designated as 'Full' Ionograms because they have the full 3.75 km Apparent-Range Resolution. The Ionograms used for most Analyses, and those available from CDAWeb, were produced by averaging every four Samples of the Sounder-Receiver Video Amplitude Output to yield an average Value every 100 µs corresponding to an Apparent-Range Resolution of 15 km. These Ionogram Files are referred to as 'Average' Files with Standard Resolution.
Each Ionogram consists of a Fixed-Frequency Portion and a Swept-Frequency Portion. The Time Resolution between Ionograms is typically 14 or 22 s depending on the Frequency Sweep Range.
Links
Get the data
- Resource spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SNT_33S_298E ↗
download · from data nasa gov
- Resource cdaweb.gsfc.nasa.gov/index.html ↗
download · from data nasa gov
- Resource cdaweb.gsfc.nasa.gov/hapi ↗
download · from data nasa gov
- Resource spdf.gsfc.nasa.gov/isis/isis-status.html ↗
download · from data nasa gov
- Resource nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1969-009A ↗
download · from data nasa gov
- Resource helio.data.nasa.gov/dataset/ISIS2_SFS_AverageIonogram_Santiago_PT22S ↗
download · from data nasa gov
- Resource hpde.io/NASA/NumericalData/ISIS2/SFS/AverageIonogram/Santiago/PT22S ↗
download · from data nasa gov
- Resource spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SNT_33S_298E ↗
download · from data nasa gov
Where it is published
- NASA Data Portal dataset page data.nasa.gov/dataset/isis-2-topside-sounder-average-ionogram-over-santiago-… ↗
landing page · from data nasa gov
- DOI doi.org/10.48322/39gd-j282 ↗
DOI / persistent id · from data nasa gov
Catalogue records · 1
- CKAN API data.nasa.gov/api/3/action/package_show?id=a6d8d354-a8ff-45bf-bd5f-2d0cd71a2… ↗
metadata API · from data nasa gov
Topics
- From keywords
- Astronomy & Astrophysics · Earth & Environmental Science · Ocean & Atmospheric Science · Physics
- Inferred from text
- Geophysics 68% · Video 75%
Provenance · 1 source records, 12 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Data Portal | a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9 | 9 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].anzsrc:group:3706 | enrichment · data nasa gov | taxonomy-embedding@1.0.0 | title+keywords+description (68%) |
| concepts[field].local:field:astronomy | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:earth-environmental | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[field].local:field:physics | mapping · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| concepts[modality].local:modality:video | enrichment · data nasa gov | keyword-concept-rules@1.0.0 | title+description (75%) |
| created_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| description | source · data nasa gov | connector:data_nasa_gov@1.0.0 | /notes |
| license_text | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| publication_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 | |
| title | source · data nasa gov | connector:data_nasa_gov@1.0.0 | /title |
| updated_date | source · data nasa gov | connector:data_nasa_gov@1.0.0 |