Planetary Kp Index, Observed or Forecast (NOAA Space Weather Prediction Center)

swpc/kp-index

NOAA's planetary K-index (Kp, 0 to 9) for the last week, from the Space Weather Prediction Center, one row per 3-hour slot in UTC. Kp measures how disturbed Earth's magnetic field is: 0 to 3 is quiet, 4 is active, 5 or more is a geomagnetic storm (NOAA scale G1 to G5) and brings aurora to lower latitudes. Choose `noaa-planetary-k-index` for observed values with the ap equivalent and the station count, or `noaa-planetary-k-index-forecast` for observed, estimated and predicted slots up to three days ahead with the NOAA G-scale on storm-level slots. Kp is in thirds (1.67 is 2-, 2.33 is 2+) and `time_tag` is the START of the slot, so the newest observed row is up to three hours old. Data from the NOAA / National Weather Service Space Weather Prediction Center, a U.S. Government work not subject to copyright. Served by Eden Engine; not an official NOAA or NWS product and not endorsed by NOAA or NWS.

activeper callv2

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

NOAA Space Weather Prediction Center

Data from the NOAA / National Weather Service Space Weather Prediction Center (services.swpc.noaa.gov), a U.S. Government work in the public domain, not subject to copyright per weather.gov/disclaimer. Served by Eden Engine; not an official NOAA or NWS product and not endorsed by NOAA or NWS.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "swpc/kp-index" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "swpc/kp-index" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "swpc/kp-index", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "swpc/kp-index", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 20, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "product"
  ],
  "properties": {
    "product": {
      "enum": [
        "noaa-planetary-k-index",
        "noaa-planetary-k-index-forecast"
      ],
      "type": "string",
      "description": "Which Kp file to read. `noaa-planetary-k-index`: observed slots only, each with `Kp`, `a_running` (the ap equivalent of that slot's Kp) and `station_count`. `noaa-planetary-k-index-forecast`: the same observed slots plus estimated and predicted ones up to about three days ahead, each with `kp`, `observed` (observed, estimated or predicted) and `noaa_scale` (G1 and up, otherwise null). Both cover about the last 7 days."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "results"
  ],
  "properties": {
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "time_tag"
        ],
        "properties": {
          "Kp": {
            "type": "number",
            "description": "Observed planetary K-index, observed file only. 0 to 9 in thirds, so 1.67 is 2- and 2.33 is 2+."
          },
          "kp": {
            "type": "number",
            "description": "Planetary K-index, forecast file only (lower-case key). 0 to 9 in thirds; observed, estimated or predicted according to `observed`."
          },
          "observed": {
            "enum": [
              "observed",
              "estimated",
              "predicted"
            ],
            "type": "string",
            "description": "Forecast file only. observed is a finished slot, estimated is a slot in progress or next with a nowcast value, predicted is a forecast."
          },
          "time_tag": {
            "type": "string",
            "description": "Start of the 3-hour slot, UTC, formatted YYYY-MM-DDTHH:MM:SS with no offset or Z. Always 00, 03, 06, 09, 12, 15, 18 or 21 hours."
          },
          "a_running": {
            "type": "integer",
            "description": "Observed file only. The ap equivalent of this slot's Kp (the standard conversion, for example Kp 3.33 is 18), not a running average."
          },
          "noaa_scale": {
            "type": [
              "string",
              "null"
            ],
            "description": "Forecast file only. The NOAA geomagnetic storm scale for the slot (G1 Minor to G5 Extreme) when it reaches storm level, otherwise null. Null means below G1, not missing data."
          },
          "station_count": {
            "type": "integer",
            "description": "Observed file only. Number of magnetometer stations the slot rests on (8 on every row sampled)."
          }
        },
        "additionalProperties": true
      },
      "description": "One object per 3-hour UTC slot, oldest first. The keys depend on the product: Kp, a_running and station_count for the observed file, or kp, observed and noaa_scale for the forecast file."
    }
  }
}