@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#> .

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    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/10.48322/7861-q181> ;
    dct:issued "2026-08-10T19:03:48.158855"^^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 Las Palmas, Canary Island, Spain: CNA, Latitude 28, Longitude 345" ;
    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",
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        "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> .

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    dcat:mediaType "application/octet-stream" .

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    dcat:accessURL <https://helio.data.nasa.gov/dataset/ISIS2_SFS_AverageIonogram_LasPalmas_PT22S> ;
    dcat:mediaType "application/octet-stream" .

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<https://data.nasa.gov/dataset/170e87b8-180e-421e-affe-646a6f2ea74f/resource/949a521b-7f83-4e3c-9288-be7c05f9ba0f> a dcat:Distribution ;
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<https://data.nasa.gov/dataset/170e87b8-180e-421e-affe-646a6f2ea74f/resource/cc8eb736-a722-46f2-935c-f0a4821a69a0> a dcat:Distribution ;
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    dcat:accessURL <https://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/CNA_28N_345E/> ;
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<https://data.nasa.gov/organization/dbb294e4-8597-44f5-aaf4-c0baac12cdbc> a org:Organization ;
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    foaf:name "NASA" .