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I was watching this on the JPL Youtube channel and it doesn't have much context other than 2 minutes of footage, and cuts to slides with some information, but not a lot of information. I'm wondering what the significance in the rise in density, and frequncy (especially in a linear form over that period of time) could be. I took a few courses so I understand the basic concept of what the spectrogram means and what spectral density is.

Basic transcript of the entire video below:

Plasma Wave Science

First information slide.

Second information slide.

Third information slide.


After looking at a bunch of the other voyager fly-by spectrograms, in the same relative density and bands as this were (as my limited research found) only on the Jupiter flyby recordings. Below is a picture of the end part of the fly-by of Jupiter.

Spectrogram of the Jupiter flyby (near the end).

It has the same sort of linear pattern, but in reverse, what is the significance of this that the video was attempting to point out? Wouldn't the large difference in timescale mean these sound sources could potentially be different, why are they correlating the two as shown? Do they think we've heard sounds from a consistent source, and if so, would this allow us to approximate factors about that source given the rise in density/frequency over time such as distance?

Could be I'm grabbing at straws here, just wondering if any analysis was/could be done, if so what was/would have been.


One of the truly helpful references I found was this document, which had a picture like this in it (page 298), which is admittedly a long leap beyond my level of understanding.

enter image description here

I know about log scaling and a few other things, but my knowledge is mostly limited to audible speech and language processing-- the scales used are beyond my current knowledge.

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