@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix org: <http://www.w3.org/ns/org#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9> a dcat:Dataset ;
    dct:description "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. 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. 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." ;
    dct:identifier <https://doi.org/10.48322/39gd-j282> ;
    dct:issued "2026-08-10T21:47:28.737768"^^xsd:dateTime ;
    dct:modified "2026-11-02T22:16:01+00:00"^^xsd:dateTime ;
    dct:publisher <https://data.nasa.gov/organization/dbb294e4-8597-44f5-aaf4-c0baac12cdbc> ;
    dct:title "ISIS-2 Topside Sounder Average Ionogram over Santiago, Chile: SNT, Latitude -33, Longitude 298" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "NASA Space Physics Data Facility" ;
            vcard:hasEmail <mailto:NASA-SPDF-Support@nasa.onmicrosoft.com> ] ;
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    dcat:keyword "auroral-kilometric-radiation-akr",
        "ducted-echoes",
        "field-aligned-irregularities-fai",
        "ground-echoes",
        "ground-reflections",
        "ionogram",
        "ionospheric-echoes",
        "ionospheric-reflections",
        "plasma-resonance",
        "plasma-waves",
        "solar-type-iii-bursts",
        "spectrum",
        "swept-frequency-sounder",
        "topside-ionosphere",
        "topside-sounder",
        "upper-hybrid-noise-band",
        "wave-scattering",
        "waves-active" ;
    dcat:theme <%7BHeliophysics%7D> .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/4ba6843a-077e-41e0-ab5c-29c2864de0d4> a dcat:Distribution ;
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    dct:modified "2026-08-10T21:47:28.692159"^^xsd:dateTime ;
    dcat:accessURL <https://cdaweb.gsfc.nasa.gov/index.html/> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/6c442048-d43c-4840-a86e-e283493a3fc0> a dcat:Distribution ;
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    dct:modified "2026-08-10T21:47:28.692827"^^xsd:dateTime ;
    dcat:accessURL <https://helio.data.nasa.gov/dataset/ISIS2_SFS_AverageIonogram_Santiago_PT22S> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/8cf3b34a-5e32-4cec-ae49-b535558b6c41> a dcat:Distribution ;
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    dcat:accessURL <https://cdaweb.gsfc.nasa.gov/hapi> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/9b5fc8b9-bdee-4ae7-bd0e-a5bbd318a173> a dcat:Distribution ;
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    dcat:accessURL <https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1969-009A> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/ad58f743-edbc-464a-ac50-36e8a583704f> a dcat:Distribution ;
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    dcat:accessURL <https://spdf.gsfc.nasa.gov/isis/isis-status.html> ;
    dcat:mediaType "text/html" .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/bf37845d-bd86-4d80-9a63-88d53d0b9633> a dcat:Distribution ;
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    dcat:accessURL <https://hpde.io/NASA/NumericalData/ISIS2/SFS/AverageIonogram/Santiago/PT22S> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/d625d919-65fa-4102-b050-2a626d54126d> a dcat:Distribution ;
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    dcat:accessURL <https://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SNT_33S_298E/> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/a6d8d354-a8ff-45bf-bd5f-2d0cd71a29f9/resource/ebf6ad9d-67ed-4ab5-97bf-a7437e138973> a dcat:Distribution ;
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    dct:modified "2026-08-10T21:47:28.691569"^^xsd:dateTime ;
    dcat:accessURL <ftps://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SNT_33S_298E/> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/organization/dbb294e4-8597-44f5-aaf4-c0baac12cdbc> a org:Organization ;
    skos:prefLabel "NASA" ;
    foaf:name "NASA" .