:Product: D-Region Absorption dregion_tab.html :Issued: 2009 Nov 24 0611 UTC # # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center. # Please send comments and suggestions to SWPC.Webmaster@noaa.gov # # Highest Affected Frequency (MHz) as a function of Latitude and Longitude # NO AFFECTED FREQUENCIES.