It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
the system monitors frequencies between 1 and 30 MHz and creates a running spectrogram or waterfall chart. In this type of chart, frequency is plotted along the y-axis, time on the x-axis and signal intensity as a color with bright yellow and red collors representing strong signal levels and darker, blue and violet collors representing weak or no signal. This type of chart gives an overall visualization of the natural ionospheric conditions on any given day. For example, a large number of bright horizontal bands on this chart would be indicative of good ionospheric propagation conditions. Conversely, a chart that is mostly blue or violet is indicative of high absorption or low ionospheric ionization. (It is important to keep in mind that the system monitors signals propagating from all directions into HAARP