HF Doppler Example

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wpeD.jpg (68583 bytes)

    The blurring around the trace is very commonly seen. The cause is unclear but may be related to patches of lightly ionised E layer.   Between 2300 and 0000 there are clearly two different components. These are the ordinary and extraordinary waves.       At 0350 the signal fades out. The ordinary wave fades first (at 0330 faintly) and the extraordinary wave fades later. Note how the fade is towards a lower frequency as the ionised area travels away from the source. Between 0420 and 0500 a patch of nightime Es are observed. Wow! A beautiful example of the o and X waves starting at different times. The frequency is high as the ionisation is approaching. These are F layer returns. The third line  now starting here is the E layer. It takes longer tobuild up to a sufficient level of ionisation than the F layer so "arrives" later.   The E layer now masks any F layer returns.   Just E layer here but look at the X-ray flare giving a characteristic return as is smashes into the E layer. The layer rapidly decends and then goes back up again. The lower plot shows a GOES trace for the same period.       This blurring is probably some other sort of disturbance.

This plot was done on 5258kHz. The horizontal scale is time (UTC) and the vertical scale is frequency (2.5Hz from top to bottom.

This plot is probably as good as it gets with lots of interesting features. It was produced by Peter G3PLX with Andy G4JNT

providing the stable carrier.


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