@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/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b> 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/mn3b-zt16> ;
    dct:issued "2026-08-10T21:46:42.489524"^^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 Kwajalein, Marshall Islands: KWA, Latitude 9, Longitude 168" ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "NASA Space Physics Data Facility" ;
            vcard:hasEmail <mailto:NASA-SPDF-Support@nasa.onmicrosoft.com> ] ;
    dcat:distribution <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/05421fe6-7354-46b4-a82b-e730ddcefea0>,
        <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/14c75cc2-0738-4c23-8cad-e4aa1c3eea39>,
        <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/4ffca0da-d373-43d9-904f-867cc34cc002>,
        <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/8d3756c3-008d-41aa-8c04-464310c51192>,
        <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/aaca44d7-9917-4d89-941a-19b3c8798c1a>,
        <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/b383efa3-4eee-4b48-b7f7-9f5f8b40f890>,
        <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/bf63222f-9b48-460f-a210-896a7755f7f6>,
        <https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/c8c8c0b7-f18c-48d5-b2bd-6f7f7e00993c> ;
    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/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/05421fe6-7354-46b4-a82b-e730ddcefea0> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:identifier "05421fe6-7354-46b4-a82b-e730ddcefea0" ;
    dct:issued "2026-08-10T21:46:42.491630"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.439217"^^xsd:dateTime ;
    dcat:accessURL <https://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/KWA_09N_168E/> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/14c75cc2-0738-4c23-8cad-e4aa1c3eea39> a dcat:Distribution ;
    dct:format "HTML" ;
    dct:identifier "14c75cc2-0738-4c23-8cad-e4aa1c3eea39" ;
    dct:issued "2026-08-10T21:46:42.491634"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.439839"^^xsd:dateTime ;
    dcat:accessURL <https://spdf.gsfc.nasa.gov/isis/isis-status.html> ;
    dcat:mediaType "text/html" .

<https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/4ffca0da-d373-43d9-904f-867cc34cc002> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:identifier "4ffca0da-d373-43d9-904f-867cc34cc002" ;
    dct:issued "2026-08-10T21:46:42.491636"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.440149"^^xsd:dateTime ;
    dcat:accessURL <https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1969-009A> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/8d3756c3-008d-41aa-8c04-464310c51192> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:identifier "8d3756c3-008d-41aa-8c04-464310c51192" ;
    dct:issued "2026-08-10T21:46:42.491631"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.439418"^^xsd:dateTime ;
    dcat:accessURL <https://cdaweb.gsfc.nasa.gov/index.html/> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/aaca44d7-9917-4d89-941a-19b3c8798c1a> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:identifier "aaca44d7-9917-4d89-941a-19b3c8798c1a" ;
    dct:issued "2026-08-10T21:46:42.491638"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.440558"^^xsd:dateTime ;
    dcat:accessURL <https://hpde.io/NASA/NumericalData/ISIS2/SFS/AverageIonogram/Kwajalein/PT22S> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/b383efa3-4eee-4b48-b7f7-9f5f8b40f890> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:identifier "b383efa3-4eee-4b48-b7f7-9f5f8b40f890" ;
    dct:issued "2026-08-10T21:46:42.491637"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.440357"^^xsd:dateTime ;
    dcat:accessURL <https://helio.data.nasa.gov/dataset/ISIS2_SFS_AverageIonogram_Kwajalein_PT22S> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/bf63222f-9b48-460f-a210-896a7755f7f6> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:identifier "bf63222f-9b48-460f-a210-896a7755f7f6" ;
    dct:issued "2026-08-10T21:46:42.491633"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.439617"^^xsd:dateTime ;
    dcat:accessURL <https://cdaweb.gsfc.nasa.gov/hapi> ;
    dcat:mediaType "application/octet-stream" .

<https://data.nasa.gov/dataset/9851d23d-6a6c-44b3-8f0d-4b1125d8df4b/resource/c8c8c0b7-f18c-48d5-b2bd-6f7f7e00993c> a dcat:Distribution ;
    dct:format "BIN" ;
    dct:identifier "c8c8c0b7-f18c-48d5-b2bd-6f7f7e00993c" ;
    dct:issued "2026-08-10T21:46:42.491626"^^xsd:dateTime ;
    dct:modified "2026-08-10T21:46:42.438980"^^xsd:dateTime ;
    dcat:accessURL <ftps://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/KWA_09N_168E/> ;
    dcat:mediaType "application/octet-stream" .

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