Shortwave station

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Shortwave pirate radiostation

WLMRadio is a shortwave radiostation that transmits at certain times on the shortwave.

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Solar-Terrestrial Data explained

The SFI number is the number of solar flares

Solar flux is measured in solar flux units (SFUs). It is the amount of radio noise or flux emitted at a frequency of 2800 MHz (10.7 cm, hence is it also called the 10.7 cm flux index).


When talking about the solar cycle the numbers are based on ‘smoothed’ numbers, this means the monthly average rather than the figures for each day. Using ‘smoothed’ numbers gives more accurate results, daily solar activity varies dramatically, making accurate results difficult. A and K INDEX are measurements of the magnetic field activity that are used in predictions.

A quick example of the A & K numbers

Say we are waiting for excellent conditions on the HF bands, then we are looking A and K indices of 0 lasting for a few days. Combined with a SFI (above 250). This can get all messed up by various random things happening on the sun, with these numbers you would be having a good time on HF.

KNMI Satellite Infrared Clouds Europe.

measures the temperature of the clouds and the surface of the Earth with an infrared sensor. This allows for the detection of changes in the temperature of clouds and that of the surface during the day and at night. Clouds are usually colder than the surface (land or water).

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