The widget displays Solar and HF-propagation conditions based on NOAA data.

rigreference

Solar conditions play a crucial role in HF-propagation conditions. RigReference.com has a widget showing the current conditions based on NOAA data. This data can be used by ham radio operators to determine the best time to make long-range communications on shortwave bands (160 to 10 meters). 
But this widget required you to edit your templates and add a little javascript snippet to them.
With this WordPress widget you can now add the solar widget to your blog easy and simple.

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