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Generating a Dopplergram of the Ionosphere

Posted by on April 8, 2012

DopplergramThere exists a way of generating a dopplergram of the Ionosphere, using a radio and soundcard software, which allow you to look at the Ionosphere, with nothing more than a computer, radio….  You can see the various changes to the Ionosphere, and learn things!  A fun combination.  A Dopplergram uses an existing radio transmitter, (like WWV), and then monitors very small Doppler shifts in the signal.  Shifts as low a .25 Hz, can be seen and graphed.

For a general overview of Dopplergrams visit ZL1PBU’s page.  You will need a piece of software to chart the received frequency vs. time.  A good place to discuss your Dopplergrams and get the software SBSpectrum is on the Yahoo group for Dopplergrams.

Below you will find a Dopplergram showing two solar flares

WWV 05/09/12

Dopplergram of the Ionosphere

Dopplergram of the Ionosphere

Note the two Solar flares at 1958, and 2105.  This was taken using WWV 10 MHz., as the source, and watching the Doppler shift of the Ionosphere.  At 2150, you can see an E/F layer split begin, this is as evening approaches at my QTH, so it is to be expected.  On other Dopplergrams, I have seen both E and F layer propagation continue all night.  All in all, this is a fairly useful tool for propagation study.


3 Responses to Generating a Dopplergram of the Ionosphere

  1. Dave


    Of course sir!! If you sign in to the Dopplergram group at Yahoo, the software is in the files section. The author is also on the group, and has an immense amount of knowledge regarding this subject. If you have any problems getting the software, just post to the group. There are about 45 people on it now, and all of them are helpful. Welcome!!

  2. Rob Welsh

    I am an assistant professor of physics & astronomy as well as an active amateur. I would like to obtain a copy of the software that creates a dopplergram of the ionosphere. I intend to use this at the college ham station as part of my teaching (intro astronomy, general physics, intro to electric circuit analysis).

    May I know how to obtain the software?
    Thank you.
    Rob, N3RW

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