At https://tallbloke.wordpress.com/2017/04/21/when-swarm-met-steve/ … Swarm is a group of satellites designed to study the Sun, the solar wind, and so on. This includes looking at the aurora caused by the solar wind inter-acting with the Earth's magnetic shield. Steve is a name applied to a specific feature of the aurora – see the image above. Steve is a ribbon of purple light. It was almost unknown until the age of satellites, 20 years ago. Now we have satellites that actually travel through Steve and take data.
See also www.esa.int/Our_Activities/Observing_the_Earth/When_Swarm_met_Steve … and for more information on Steve see http://blog.aurorasaurus.org/?p=449
See also https://phys.org/print411984404.html ….
