Enceladus Leaves Plasma Bubbles in its Wake
RAS NAN 2010
Encedalus rapidly became my favourite moon after watching Brian Cox’s “Wonders of the Solar System” series. Beforehand, Europa and Titan were battling it out for supremacy. Discovered in 1789 by William Herschel, Enceladus won the top spot after I saw footage of the water rich plume jetting into space from the satellite’s south pole. As such I greeted the results of the latest research into this wondrous moon with great interest.
Enceladus sits deep within Saturn’s magnetosphere, which is filled with electrically charged particles (plasma) originating from both the planet and its moons. The Cassini spacecraft has made nine fly-bys of the mysterious sixth-largest moon since 2005. The closest of these have taken the spacecraft’s suite of instruments just 25 km from Enceladus’ surface, which scientists believe conceals a saline ocean. Heated vents at the south pole of the moon release a plume of material, consisting mainly of icy grains and water vapour, into space. Measurements from the Cassini Plasma Spectrometer (CAPS) and the Magnetospheric IMaging Instrument (MIMI) show that both the moon and its plume are continuously soaking up the plasma, which rushes past at around 30 kilometres per second, leaving a cavity downstream. In addition, the most energetic particles which zoom up and down Saturn’s magnetic field lines are swept up, leaving a much larger void in the high energy plasma. Material from Enceladus, both dust and gas, is also being charged and forming new plasma.
Now, Ms Kanani and a team at UCL’s Mullard Space Science Laboratory, have discovered mysterious spiky features in the CAPS data that present a complex picture of readjustment downstream from Enceladus.
“Eventually, the plasma closes the gap downstream from Enceladus but our observations show that this isn’t happening in a smooth, orderly fashion. We are seeing spiky features in the plasma that last between a few tens of seconds and a minute or two. We think that these might represent bubbles of low energy particles formed as the plasma fills the gap from different directions”
Since Cassini arrived at Saturn, it has been building up a picture of the vital and unexpected role that Enceladus plays in Saturn’s magnetosphere.
“Enceladus is the source of most of the plasma in Saturn’s magnetosphere, with ionised water and oxygen originating from the vents forming a big torus of plasma that surrounds Saturn. We may see these spiky features in the wake of Saturn’s other moons as they interact with the plasma but, to date, we have only studied Enceladus in sufficient detail”
Sheila Kanani will be presenting the results at the RAS National Astronomy Meeting in Glasgow on Thursday 14th April.