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The spectrogram above is a live feed unless shown as "offline".
The receiver is a Kenwood
TS480 tuned to 55.249MHz and located in Rochester
Hills, MI. The transmitter being monitored is unknown but
presumed to be in Ontario Canada. Spectrogram software is Spectrum Lab.
For a more detailed look at interpreting a spectrogram, see Spectrogram Interpretation.
But in a nutshell, the thin red line near the bottom of the
screen at the 1000 Hz position is the residual video carrier (not
always present). It corresponds to the continuous 1KHz tone in
the audio feed. The vertical blips above or below the 1000 Hz
position are meteor trails and correspond to pings in the audio
feed. Vertical blips followed by horizontal features are larger
meteors that produce persistent ionized trails. They would sound
like a ping followed by a gradually fading steady tone.
Horizontal feature that are not associated with a vertical blip
are often momentary propagation enhancement such as "sporadic E" and
usually sound like a fluttering steady tone.
Paul Goelz
2010
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Radio
Meteor Live Spectrogram Feed