Geoscientific Instrumentation, Methods and Data Systems
Geoscientific Instrumentation, Methods and Data Systems
GI
Articles | Volume 6, issue 1
Articles | Volume 6, issue 1
https://doi.org/10.5194/gi-6-1-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/gi-6-1-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 6, issue 1
Research article
 | 
10 Jan 2017
Research article |  | 10 Jan 2017

Mass spectrometry of planetary exospheres at high relative velocity: direct comparison of open- and closed-source measurements

Stefan Meyer, Marek Tulej, and Peter Wurz

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Latest update: 04 Nov 2025
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Short summary
We developed a prototype of the Neutral Gas and Ion Mass spectrometer (NIM) of the Particle Environment Package (PEP) for the JUICE mission of ESA. NIM will be used to measure the chemical composition of the exospheres of the icy Jovian moons. The NIM prototype was successfully tested under realistic conditions and we find that the closed source behaves as expected within the JUICE mission phase velocities. No additional fragmentation of the species recorded with the closed source is observed.
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