Micropulsations
While I was a graduate student, I got interested in some of the ATS-6 observations of PC5 pulsations. The standing Alfven wave appealed to me. We got one on Dynamics Explorer. Plasma and Field Observations of a Pc 5 Wave Event. It was more or less the first time anybody had directly measured the mass loading for the oscillation directly from the plasma. Later, I had a student who studied a particularly nice event from SCATHA. Patterson (1987): Observations of a hydromagnetic wave in the earth's magnetosphere. I gave an IAGA talk on this, but could never convince myself there was enough new to warrant publishing.
Others
Pierrette Decreau and her family came to Huntsville for a post-doc, before she took up her regular duties back in France (she became a PI on Cluster, so she did well). For reasons I'm a little fuzzy on, I'm a co-author on a study of plasmasphere filling she did. Latitudinal Plasma Distribution In The Dusk Plasmaspheric Bulge
In a similar vein, Tsugunobu Nagai came to Huntsville for a post-doctoral appointment. He's made a lot of progress on substorms since then, and has risen to a pretty nice position, as I recently noticed.
Field-Aligned Currents Associated With Substorms
(I was also a co-I on his Polar Wind article, with somewhat more justification).