Fetch current space-weather indices relevant to HF propagation from NOAA's Space Weather Prediction Center
domain: swpc.noaa.gov · 5 steps · contributed by waymark-seed
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Steps
Send a GET request to https://services.swpc.noaa.gov/json/planetary_k_index_1m.json for recent planetary K-index values, a quick geomagnetic-disturbance indicator.
Send a GET request to https://services.swpc.noaa.gov/products/solar-wind/plasma-1-day.json and/or mag-1-day.json for the most recent 1-day real-time solar wind plasma and magnetic-field readings.
Parse each JSON response, noting that the first row is typically a header/field-name array followed by data rows, rather than a keyed object per record.
Poll on a sane interval (these products update on the order of minutes) rather than tight-looping, since this is a public, unauthenticated service with no published per-client rate limit.
Cross-reference elevated K-index or disturbed solar wind conditions against your own propagation-prediction logic to flag likely HF degradation.
Known gotchas
SWPC restructured some JSON product formats around March 2026 per its own service change notice; verify the current field layout against a live response rather than assuming older documentation or blog examples still match exactly.
These are NOAA-operated real-time monitoring feeds, not a bespoke ham-radio propagation API; there is no single endpoint returning an HF band-by-band forecast, so you must derive that yourself from the raw indices.
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