# A thermal model of Rosetta/ROSINA/DFMS to assess the effects of solar illumination and thermal inertia of the mass spectrometer on mass spectra at 67P/Churyumov-Gerasimenko

Johan de Keyser, Andrew Gibbons, Eddy Neefs, Eddy Equeter, Frederik Dhooghe, Romain Maggiolo, Gaël Cessateur, Herbert Gunell, Kathrin Altwegg, Jean-Jacques Berthelier, et al.

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## ► To cite this version:

Johan de Keyser, Andrew Gibbons, Eddy Neefs, Eddy Equeter, Frederik Dhooghe, et al. A thermal model of Rosetta/ROSINA/DFMS to assess the effects of solar illumination and thermal inertia of the mass spectrometer on mass spectra at 67P/Churyumov-Gerasimenko. EGU General Assembly 2016, Apr 2016, Vienne, Austria. insu-03573536

HAL Id: insu-03573536

https://insu.hal.science/insu-03573536

Submitted on 15 Feb 2022

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A thermal model of Rosetta/ROSINA/DFMS to assess the effects of solar illumination and thermal inertia of the mass spectrometer on mass spectra at 67P/Churyumov-Gerasimenko

Johan De Keyser (1), Andrew Gibbons (1), Eddy Neefs (1), Eddy Equeter (1), Frederik Dhooghe (1), Romain Maggiolo (1), Gaël Cessateur (1), Herbert Gunell (1), Kathrin Altwegg (2), Jean-Jacques Berthelier (3), Christelle Briois (4), Ursina Calmonte (2), Michael R. Combi (5), Björn Fiethe (6), Stephen Fuselier (7), Tamas Gombosi (5), Myrttha Hässig (2), Léna Le Roy (2), Martin Rubin (2), and Thierry Sémon (2)

(1) Belgian Institute for Space Aeronomy, Space Physics, Brussels, Belgium (johandk@aeronomie.be), (2) Physikalisches Institut, University of Bern, Bern, Switzerland, (3) LATMOS/IPSL, Université Versailles Saint-Quentin, France, (4) LPC2E, Université d'Orléans, France, (5) Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, Michigan, USA, (6) Institute of Computer and Network Engineering, TU Braunschweig, Braunschweig, Germany, (7) Southwest Research Institute, San Antonio, Texas, USA

The coma composition of comet 67P/Churyumov-Gerasimenko is being analysed in detail with the high mass resolution Double Focussing Mass Spectrometer (DFMS) that is part of the ROSINA instrument suite on board of the Rosetta spacecraft. The Rosetta spacecraft – and DFMS in particular – experiences changing behaviour as the temperature varies with illumination and distance from the Sun. This contribution highlights these changes and their practical consequences for the interpretation of the DFMS mass spectra. A thermal model is presented that addresses thermal behaviour on a long time scale, related to instrument illumination and thermal gradients inside DFMS, and on a short time scale, related to transients after on/off cycling of the instrument and thermal inertia. Both issues adversely affect the problem of establishing a proper instrument mass calibration.