What are Web sources for flux density for the Sun at specific radiomagnetic frequencies?
This answer is courtesy of Kent Doggett, of the National Oceanic and Atmospheric Administration (NOAA).

There are a number of sources of solar radio flux data on the Web. Our NOAA gopher server has daily flux values (taken at local noon at the measuring observatory) at a number of discrete frequencies. From our homepage http://www.swpc.noaa.gov follow the "Products and Data" link to "Forecasts". The direct address is http://www.swpc.noaa.gov/products/27-day-outlook-107-cm-radio-flux-and-geomagnetic-indices .

The National Geophysical Data Center has a few radio solar radio links at http://www.ngdc.noaa.gov/stp/solar/solarradio.html.

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Special Thanks to K. Doggett