{
  "HAPI": "3.2",
  "x_description": "This dataset contains the baseline for the X and Y components of the magnetic field. Baselines are obtained from 32 magnetometer stations during 2001-2010: Ny AAlesund (NAL), Longyearbyen (LYR), Hornsund (HOR), Hopen Island (HOP), Bjoernoeya (BJN), Nordkapp (NOR), Soeroeya (SOR), Kevo (KEV), Tromsoe (TRO), Masi (MAS), Andenes (AND), Kilpisjarvi (KIL), Ivalo (IVA), Abisko (ABK), Leknes (LEK), Muonio (MUO), Lovozero (LOZ), Kiruna (KIR), Sodankyla (SOD), Pello (PEL), Doenna (DON), Roervik (RVK), Lycksele (LYC), Oulujarvi (OUJ), Mekrijarvi (MEK), Hankasalmi (HAN), Dombaas (DOB), Solund (SOL), Nurmijarvi (NUR), Uppsala (UPS), Karmoey (KAR), Tartu (TAR). Baseline values are given in the order of the above stations. For the option to expand the number of stations in the future, we have reserved in the data format eight more places for new station names. For these station names we use fill values ADi, where i=1…8. Magnetic baseline for X and Y components is then given for 40 stations and it is equal to baseline fill value for the stations that don't exist at the moment. In order to derive a baseline, quiet days per month have to be selected. A criteria for the quiet days selection is explained in the dataset for the quiet days. From the fast Fourier transform of the magnetic field during quiet days, first seven harmonics are selected and their inverse Fourier transform defines a template. To obtain the diurnal baseline, templates are interpolated continuously between midday of the previous assigned quiet day and midday on the next assigned quiet day. To obtain the full baseline, the diurnal variations are added to a long-term baseline which is obtained by interpolating between the daily median values. The derivation of daily median values is described in the median dataset.  This dataset was generated as part of European Union ECLAT project. The aim of the European Cluster Assimilation Technology (ECLAT) is to provide a novel data base, by providing an upgrade to the CAA. To achieve this, ECLAT programme ingests into the CAA supporting data from other space- and ground-based observatories, provide data mining routines, refine data products and software tools for their visualisation, and develop existing European magnetospheric modeling infrastructure to provide context for the observational data.  The contacts for the ECLAT project are Steve Milan, University of Leicester Rumi Nakamura, Oesterreichische Akademie der Wissenschaften Kirsti Kauristie, Finnish Meterological Institute Victor Sergeev, Petersburg State University Hermann Opgenoorth, Swedish Institute of Space Physics",
  "cadence": "PT10.000000S",
  "parameters": [
    {
      "type": "isotime",
      "units": "UTC",
      "name": "time_tags",
      "description": "Time tag start of integration period",
      "label": "Universal Time",
      "length": 24,
      "fill": null
    },
    {
      "type": "double",
      "name": "B_baseline_xy_geo",
      "description": "Baseline of the magnetic field for 40 stations",
      "label": "Baseline of the magnetic field for 40 stations",
      "units": "nT",
      "fill": "99999.99",
      "size": [
        40,
        2
      ]
    }
  ],
  "startDate": "2001-01-01T00:00Z",
  "stopDate": "2011-01-01T00:00Z",
  "x_tap_url": "https://csa.esac.esa.int/csa-sl-tap/data?retrieval_type=HEADER&DATASET_ID=CC_CP_AUX_ECLAT_MAG_BASELINE&FORCEPACK=false",
  "x_tap_data_url": "https://csa.esac.esa.int/csa-sl-tap/data?RETRIEVAL_TYPE=product&RETRIEVAL_ACCESS=streamed&DATASET_ID=CC_CP_AUX_ECLAT_MAG_BASELINE&START_DATE=2011-01-01T00:00Z&END_DATE=2011-01-01T00:00Z",
  "status": {
    "code": 1200,
    "message": "OK"
  },
  "x_LastUpdate": "2026-04-12T15:11:45Z"
}