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This web page df3lp.de has the following in the web page, "Reacts to ultraviolet, X-ray, gamma-ray and other types of cosmic rays." Our analyzers saw that the website also stated " Propagation depends on the lower regions of the ionosphere called E- and D-Layer." The Website also said " These are in fact not sharp bordered layers. So we call them better as regions of plasma. Night time radio propagation happens via the ionosphere at heights above 100 km. During the day solar radiaton generates the D-Region. Of these multiple waves fed into the receivers front-end." The website's header had ionosphere as the most important optimized keyword. It is followed by longwave, vlf, and sid which isn't as highly ranked as ionosphere. The next words df3lp.de used was sudden ionospheric disturbances. solar flares was included but will not be understood by search engines.