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https://doi.org/10.5194/egusphere-2026-1096
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egusphere-2026-1096
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Preprints
06 Mar 2026
 | 06 Mar 2026
Status: this preprint is open for discussion and under review for Annales Geophysicae (ANGEO).

Juice/SWI during the Lunar-Earth-Gravity-Assist. III. Observations of the Earth as Calibration Target

Christopher Jarchow, Ladislav Rezac, Paul Hartogh, Ali Schulz-Ravanbakhsh, Thibault Cavalie, Fabrice Herpin, Raphael Moreno, and Axel Murk

Abstract. On August 19th and 20th 2024 the Jupiter Icy Moons Explorer (Juice) executed during its cruise phase towards Jupiter a combined Lunar Earth Gravity Assist (LEGA) maneuver. These close flybys of the Moon and the Earth provided so far the best opportunity to test the behavior, performance, and calibration of the Submillimetre Wave Instrument (SWI) onboard Juice. This paper shows typical data taken during the Earth Gravity Assist and the following few days. Data quality and problems resulting from unexpected behavior of the hardware are discussed.

How to cite. Jarchow, C., Rezac, L., Hartogh, P., Schulz-Ravanbakhsh, A., Cavalie, T., Herpin, F., Moreno, R., and Murk, A.: Juice/SWI during the Lunar-Earth-Gravity-Assist. III. Observations of the Earth as Calibration Target, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2026-1096, 2026.
Received: 27 Feb 2026 – Discussion started: 06 Mar 2026
Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this paper. While Copernicus Publications makes every effort to include appropriate place names, the final responsibility lies with the authors. Views expressed in the text are those of the authors and do not necessarily reflect the views of the publisher.
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Christopher Jarchow, Ladislav Rezac, Paul Hartogh, Ali Schulz-Ravanbakhsh, Thibault Cavalie, Fabrice Herpin, Raphael Moreno, and Axel Murk

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Christopher Jarchow, Ladislav Rezac, Paul Hartogh, Ali Schulz-Ravanbakhsh, Thibault Cavalie, Fabrice Herpin, Raphael Moreno, and Axel Murk
Christopher Jarchow, Ladislav Rezac, Paul Hartogh, Ali Schulz-Ravanbakhsh, Thibault Cavalie, Fabrice Herpin, Raphael Moreno, and Axel Murk

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Short summary
The Jupiter Icy Moons Explorer is a spacecraft sent towards Jupiter to perform detailed observations of the giant gas planet & its Galilean satellites. The Submillimetre Wave Instrument onboard this spacecraft is a newly built instrument, which first of all has to demonstrate proper performance before the observed data can be trusted. Using the Earth as a well-known observation target, proper functionality of this instrument has been verified during the Lunar Earth Gravity Assist in August 2024.
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