SETI@home: Frequency Histograms


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SETI@home uses frequency histograms to spot frequencies where we've detected an inordinate number of radio waves. Such a "spike" of events at a particular frequency is typically representative of either test signals injected into our data recorder (to verify proper functioning) or RFI that uses specific transmission frequencies.


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Above are two sample frequency histograms taken from spike data recorded on May 24, 2000. The histogram on the left plots all spikes recorded on that day; the one on the right ignores artificially injected spikes at 1418MHz, 1420Mhz, and 1421Mhz. Also viewable are power histograms from the same day.

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