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Solar Data Feeds: JSON, XML and RSS

Name: Solar-terrestrial and HF propagation indices
Creator: Map For HAM
License: https://www.swpc.noaa.gov/content/data-access

Free machine-readable solar-terrestrial data: current solar flux, sunspots, A and K index, X-ray flux, solar wind, Bz and calculated HF band conditions, as JSON, XML or RSS.

Endpoints

Format	URL
JSON	`/hf-propagation/data/solar.json`
JSON with history	`/hf-propagation/data/solar.json?full=1`
XML	`/hf-propagation/data/solar.xml`
RSS	`/hf-propagation/data/solar.rss`

Terms of use

Free for personal, club and non-commercial use. Please link back to this site.
Data updates about every 5 minutes: poll no more than once every 5 minutes.
CORS is open, so you can call the JSON feed from a browser.
No guarantee of availability. If the upstream source is down, the last valid values are served.

Sample JSON (live)

{
    "source": "NOAA SWPC via Map For HAM - https://www.mapforham.com/hf-propagation/",
    "updated": "2026-10-22T11:43:07+00:00",
    "solar_flux": 115,
    "sunspots": 66,
    "a_index": 17,
    "kp": 3,
    "k_index": 3,
    "xray_class": "C1.1",
    "xray_flux": 1.0591988939268049e-6,
    "solar_wind_speed": 449.2,
    "solar_wind_density": 4.63,
    "bz": -0.27,
    "bt": 6.73,
    "geomagnetic_field": "UNSETTLED",
    "aurora_latitude": 61.3,
    "noaa_scales": {
        "R": 0,
        "G": 0
    },
    "bands": [
        {
            "name": "80m-40m",
            "day": "Fair",
            "night": "Good"
        },
        {
            "name": "30m-20m",
            "day": "Good",
            "night": "Fair"
        },
        {
            "name": "17m-15m",
            "day": "Fair",
            "night": "Fair"
        },
  ...

Fields

JSON field	XML element	Meaning
`solar_flux`	`solarflux`	Solar flux index at 10.7 cm (sfu)
`sunspots`	`sunspots`	Sunspot number (daily)
`a_index`	`aindex`	A-index, mean of the last eight 3-hour values
`kp / k_index`	`kpindex / kindex`	Planetary Kp (decimal) and rounded K
`xray_class / xray_flux`	`xray`	GOES X-ray class (for example B5.8) and flux in W/m²
`solar_wind_speed`	`solarwind`	Solar wind speed in km/s
`bz / bt`	`magneticfield`	Interplanetary magnetic field Bz and total Bt in nT
`geomagnetic_field`	`geomagfield`	QUIET, UNSETTLED, ACTIVE or STORM
`aurora_latitude`	`latdegree`	Approximate equatorward edge of the auroral oval (geomagnetic latitude)
`bands / bands_detail`	`calculatedconditions`	Calculated HF conditions (Good, Fair, Poor), day and night
`noaa_scales`	`-`	Current NOAA R (radio blackout) and G (geomagnetic storm) scale levels

Examples

curl

curl https://www.mapforham.com/hf-propagation/data/solar.json

PHP

<?php
$d = json_decode(file_get_contents('https://www.mapforham.com/hf-propagation/data/solar.json'), true);
echo $d['solar_flux'];

Python

import requests
d = requests.get('https://www.mapforham.com/hf-propagation/data/solar.json', timeout=10).json()
print(d['solar_flux'], d['k_index'])

The band conditions are estimates computed by this site, see the methodology. Prefer a ready-made image? Use the banners.

Data: NOAA Space Weather Prediction Center, NASA SDO. Band conditions are estimates computed by Map For HAM and are indicative only. Methodology and credits · Data feeds · Widgets