A preprint analyzing seven years of Van Allen Probes data reports that outer-belt electron flux was far higher during high-Alfvénicity solar wind, with seasonal coherence strongest near solar minimum. The observational result points to a possible role for magnetic fluctuations but does not establish causation or show that it applies beyond solar cycle 24.
An arXiv preprint reports a six-parameter mean model, a seven-parameter upper-80% estimate and a lognormal fit, while showing why the 95% tail remains unreliable.
A single purple STEVE arc over Antarctica coincided with changes in navigation-satellite signals during quiet geomagnetic conditions, but the preprint cannot show that STEVE caused them or quantify positioning error.