{
  "@type": "dcat:Dataset",
  "accessLevel": "public",
  "bureauCode": [
    "026:00"
  ],
  "contactPoint": {
    "@type": "vcard:Contact",
    "fn": "NASA Space Physics Data Facility",
    "hasEmail": "mailto:NASA-SPDF-Support@nasa.onmicrosoft.com"
  },
  "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.",
  "distribution": [
    {
      "@type": "dcat:Distribution",
      "downloadURL": "ftps://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SOL_52S_302E/",
      "format": "BIN",
      "mediaType": "application/octet-stream"
    },
    {
      "@type": "dcat:Distribution",
      "downloadURL": "https://cdaweb.gsfc.nasa.gov/hapi",
      "format": "BIN",
      "mediaType": "application/octet-stream"
    },
    {
      "@type": "dcat:Distribution",
      "downloadURL": "https://cdaweb.gsfc.nasa.gov/index.html/",
      "format": "BIN",
      "mediaType": "application/octet-stream"
    },
    {
      "@type": "dcat:Distribution",
      "downloadURL": "https://helio.data.nasa.gov/dataset/ISIS2_SFS_AverageIonogram_FalklandIslands_PT22S",
      "format": "BIN",
      "mediaType": "application/octet-stream"
    },
    {
      "@type": "dcat:Distribution",
      "downloadURL": "https://hpde.io/NASA/NumericalData/ISIS2/SFS/AverageIonogram/FalklandIslands/PT22S",
      "format": "BIN",
      "mediaType": "application/octet-stream"
    },
    {
      "@type": "dcat:Distribution",
      "downloadURL": "https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1969-009A",
      "format": "BIN",
      "mediaType": "application/octet-stream"
    },
    {
      "@type": "dcat:Distribution",
      "downloadURL": "https://spdf.gsfc.nasa.gov/isis/isis-status.html",
      "format": "HTML",
      "mediaType": "text/html"
    },
    {
      "@type": "dcat:Distribution",
      "downloadURL": "https://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/SOL_52S_302E/",
      "format": "BIN",
      "mediaType": "application/octet-stream"
    }
  ],
  "identifier": "https://doi.org/10.48322/gn72-s865",
  "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"
  ],
  "landingPage": "https://doi.org/10.48322/gn72-s865",
  "license": "https://www.usa.gov/government-works",
  "modified": "2026-08-17",
  "programCode": [
    "026:000"
  ],
  "publisher": {
    "@type": "org:Organization",
    "name": "SPDF"
  },
  "theme": [
    "Heliophysics"
  ],
  "title": "ISIS-2 Topside Sounder Average Ionogram over Falkland Island, United Kingdom: SOL, Latitude -52, Longitude 302"
}