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It is Friday, September 11, 2026, 0506 UTC

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Radio Propagation

Indices from the U.S. NOAA Space Weather Prediction Center in Boulder Colorado, updated every three hours and published here in real time:

Solar-terrestrial indices for 10 September follow. Solar flux 115 and estimated planetary A-index 9. The estimated planetary K-index at 0300 UTC on 11 September was 1.33. No space weather storms were observed for the past 24 hours. No space weather storms are predicted for the next 24 hours.

What does this mean for AM DXers?

Here's the short story: High solar flux (solar flux is expected to bottom out at around 70 in the upcoming couple of years, and then begin rising to 150-200 when the next solar maximum is reached around mid-2020's), high A-index (over 10) geomagnetic storms, proton events and polar-cap absorption are bad news; they tend to mean poor long-distance reception of mediumwave and tropical band shortwave stations, especially paths over polar areas and paths to east and west of your location are affected. If you live far north, reception may be good towards south and vice versa on the Southern hemisphere.
Space weather phenomena explained (SWPC)
Geophysical alert information (LWCA)

Current situation:
Space weather (SWPC)
Space weather dashboard (SWPC)
DST Index (Kyoto) (see also DST FAQ by AER)
DCX index (Oulu University)
K index (SWPC)
K index Norway (Tromsø)
K index Germany (GFZ)
K index Australia (BOM)
Solar activity data (Solen.info)
Space weather (spaceweather.com)
Space weather (solarham.net)
Auroras and Space weather Finland (FMI)
Space weather Canada (NRCan)
GOES proton flux (SWPC)

Forecasts:
3-day forecast (SWPC)
27-day forecast (SWPC)
45-day forecast (USAF)
Space weather forecast (Japan)

Long-term data (solar cycle history):
Solar cycle progression (SWPC)
Solar cycle sunspots (SIDC)

The propagation indices are temporarily unavailable. The Propagation page is also unable to retrieve the indices from NOAA. We are sorry for the inconvenience and hope that the problem will be fixed soon. Meanwhile, you can get the latest A-Index and Solar Flux forecast by clicking here.

Source: NOAA Space Weather
Prediction Center