Evolution of H2O related species in the neutral coma of 67P
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Christelle Briois
- Function : Author
- PersonId : 974700
Johan de Keyser
- Function : Author
- PersonId : 972575
Léna Le Roy
- Function : Author
- PersonId : 18376
- IdHAL : lena-le-roy
- ORCID : 0000-0002-5984-6153
Bernard Marty
- Function : Author
- PersonId : 854612
Olivier Mousis
- Function : Author
- PersonId : 828430
Abstract
The ROSINA-DFMS mass spectrometer has been probing the coma of 67P
since the spacecraft arrived at the comet in August 2014.
The acquired data set covers a large range of viewing geometries for
the ever changing conditions of 67P along its journey to pericenter. With the high temporal resolution
of ROSINA-DFMS we are able to examine diurnal and seasonal changes
of different species in the gaseous coma.
Large scale heterogeneities in the coma have been reported
since the very first measurements of the neutral inventory at 67P.
Many of the minor species are seen to follow one of the major compounds,
H2O, CO or CO2.
In this paper we will present the latest results on H2O related species.
We will discuss the possible trapping/building mechanisms responsible
for these species and why it is different from other species such as
CO, N2 or CO2.