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Time variability of the Enceladus plumes: Orbital periods, decadal periods, and aperiodic change

Ingersoll, Andrew P. and Ewald, Shawn P. and Trumbo, Samantha K. (2020) Time variability of the Enceladus plumes: Orbital periods, decadal periods, and aperiodic change. Icarus, 344 . Art. No. 113345. ISSN 0019-1035. https://resolver.caltech.edu/CaltechAUTHORS:20190613-100155505

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Abstract

The Enceladus plumes vary on a number of timescales. Tidal stresses as Enceladus revolves in its eccentric orbit lead to a periodic diurnal variation in the mass and velocity of solid particles in the plume. Tidal stresses associated with an orbital resonance with Dione lead to a periodic decadal variation. Aperiodic variations occur on time scales of months, and may be due to ice buildup and flow of the walls of the fissures that connect the ocean to the surface. We document these variations using all the relevant data taken by the ISS instrument from 2005 to 2017. Key questions now include how a 5% peak-to-peak variation in orbital eccentricity, which itself is only 0.0045, could lead to a 2-fold decadal variation in plume properties. Another question is how the plumes stay open if ice builds up every month and clogs the vents. Other questions include why the solid particles exit the vents several times slower than the gas, and why the speeds vary inversely with the mass of the plumes. The Cassini data are in, but the modeling has just begun.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.icarus.2019.06.006DOIArticle
ORCID:
AuthorORCID
Ingersoll, Andrew P.0000-0002-2035-9198
Ewald, Shawn P.0000-0002-1567-9154
Trumbo, Samantha K.0000-0002-0767-8901
Additional Information:© 2020 Elsevier Inc. Received 15 February 2019, Revised 24 May 2019, Accepted 10 June 2019, Available online 13 June 2019. This research was supported by the National Aeronautics and Space Administration through the Cassini Project Office and through the Cassini Data Analysis Program grant number NNX15AH08G.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
NASANNX15AH08G
Subject Keywords:Enceladus; Saturn satellites; Tides; Solid body
Record Number:CaltechAUTHORS:20190613-100155505
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190613-100155505
Official Citation:Andrew P. Ingersoll, Shawn P. Ewald, Samantha K. Trumbo, Time variability of the Enceladus plumes: Orbital periods, decadal periods, and aperiodic change, Icarus, Volume 344, 2020, 113345, ISSN 0019-1035, https://doi.org/10.1016/j.icarus.2019.06.006.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:96361
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jun 2019 17:10
Last Modified:23 Jun 2020 20:59

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