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Hi Richard,

That narrow band stuff is common in Io-C. It's called an "N event." N for narrow band. N events can be smooth and continuous, or they can be made of trains of narrow band S bursts (what your spectrogram looks like), or they can be a combination of both. Usually in Io-C, we see the S burst trains early in the storm, shifting to continuous emission style N events later in the storm. Usually. Not always. Everything related to Jovian DAM is probabilistic, very few absolutes.

Io-C exhibits what are known as vertex-late arcs. For we who observe in the upper half of the HF band, that means the frequency drift over time is negative. The downward freq drift you observed is exactly what we expect from Io-C.

One of these days I want to write a tutorial about the phase plane and arc shapes and polarization and emission types and a bunch of other stuff, all aimed at the Radio JOVE audience.

But, my round tuit has been finite yet unbounded for decades, so in the meantime here are a few good references:






--
Dave