Titan's variable ionosphere during the T118-T119 Cassini flybys

EDBERG, N. J. ET AL.; BERTUCCI, C.

GEOPHYSICAL RESEARCH LETTERS

AMER GEOPHYSICAL UNION

Año: 2018

0094-8276

We report on unusual dynamics in Titan´s ionosphere as a significant difference in ionospheric electron density is observed between the T118 and T119 Cassini nightside flybys. Two distinct nightside electron density peaks were present during T118, at 1150 and 1200 km, and the lowest density ever observed in Titan´s ionosphere at altitudes 1000-1350 km was during T118. These flybys were quite similar in geometry, Saturn local time, neutral density, EUV flux and ambient magnetic field conditions. Despite this, the Radio and Plasma Waves/Langmuir Probe measured a density difference up to a factor of 6 between the passes. The overall difference was present and similar both inbound and outbound. By ruling out other factors, we suggest that an exceptionally low rate of particle impact ionisation in combination with dynamics in the ionosphere is the explanation for the observations