Constraining the Enceladus plume using numerical simulation and Cassini data

Fast and Slow Water Ion Populations in the Enceladus Plume

“…By applying the vent findings from Jones et al () we find that the start of the lower energy peak at 19:06:57 matches the E5i1 peak (see Jones et al, ), which was associated with Vent V. This vent was assigned a bulk velocity of 1,030 m/s by Tenishev et al (). However, this assignment does not concur with the results of Yeoh et al (), they find Vent III to be the major source. Assuming the Vent V assignment is correct it implies the ion velocity is 570 m/s higher than the neutral bulk velocity but this still lies in the range reported by Hansen et al ().…”

“…The main water peak broadens and the lower peak is weakened during the 19:07:01–19:07:03 IBS sweep. The lower intensity could be due to a reduced dust‐gas ratio at the Cairo sulcus compared to Baghdad (Hedman et al, ), it could also be due to less active jets (Yeoh et al, ).…”

“…Through a combination of INMS and UVIS measurements, Teolis et al (2017) suggested Mach numbers up to 10, corresponding to jet velocities of 6 km/s using a thermal velocity of 576 m/s. Other fitting attempts such as that performed by Yeoh et al (2017) using INMS and UVIS data considering diffuse and jet sources, found velocities in excess of Mach 5 (1,500 m/s) caused by narrow jets at the vent represented best during the E5 flyby. Yeoh et al (2017) found that Vents III, IV, and VI were the strongest influences during the E5 flyby.…”

“…Other fitting attempts such as that performed by Yeoh et al (2017) using INMS and UVIS data considering diffuse and jet sources, found velocities in excess of Mach 5 (1,500 m/s) caused by narrow jets at the vent represented best during the E5 flyby. Yeoh et al (2017) found that Vents III, IV, and VI were the strongest influences during the E5 flyby. The model by Tenishev et al (2014) fitted bulk velocities to the eight vents found by Spitale and Porco (2007), finding a range of velocities between 580 and 1,338 m/s.…”

DSMC simulation of Europa water vapor plumes

“…Hence a simulation of the plume exclusively above the surface still yields valuable insight. For an example of subsurface details that may be inferred from higher fidelity plume observations, in this case at Enceladus, see Yeoh et al (2016 ).…”