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Outflow and plasma acceleration in Titan's induced magnetotail: Evidence of magnetic tension forces
Author(s) -
Romanelli N.,
Modolo R.,
Dubinin E.,
Berthelier J.J.,
Bertucci C.,
Wahlund J. E.,
Leblanc F.,
Canu P.,
Edberg N. J. T.,
Waite H.,
Kurth W. S.,
Gurnett D.,
Coates A.,
Dougherty M.
Publication year - 2014
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2014ja020391
Subject(s) - plasma , ionosphere , titan (rocket family) , physics , atomic physics , ion , magnetic field , outflow , electron , plasma acceleration , computational physics , geophysics , astrobiology , nuclear physics , meteorology , quantum mechanics
Cassini plasma wave and particle observations are combined with magnetometer measurements to study Titan's induced magnetic tail. In this study, we report and analyze the plasma acceleration in Titan's induced magnetotail observed in flybys T17, T19, and T40. Radio and Plasma Wave Science observations show regions of cold plasma with electron densities between 0.1 and a few tens of electrons per cubic centimeter. The Cassini Plasma Spectrometer (CAPS)‐ion mass spectrometer (IMS) measurements suggest that ionospheric plasma in this region is composed of ions with masses ranging from 15 to 17 amu and from 28 to 31 amu. From these measurements, we determine the bulk velocity of the plasma and the Alfvén velocity in Titan's tail region. Finally, a Walén test of such measurements suggest that the progressive acceleration of the ionospheric plasma shown by CAPS can be interpreted in terms of magnetic tension forces.