First Results of Mars Express—ExoMars Trace Gas Orbiter Mutual Radio Occultation

Author:

Parrott Jacob1ORCID,Svedhem Håkan2ORCID,Witasse Olivier3,Wilson Colin3ORCID,Müller‐Wodarg Ingo1ORCID,Cardesín‐Moinelo Alejandro456ORCID,Schmitz Peter7ORCID,Godfrey James7,Reboud Olivier7,Geiger Bernhard4ORCID,Sánchez‐Cano Beatriz8ORCID,Nava Bruno9ORCID,Migoya‐Orué Yenca9ORCID

Affiliation:

1. Imperial College London London UK

2. TU Delft Delft The Netherlands

3. European Space Research and Technology Centre ESA‐ESTEC Noordwijk The Netherlands

4. European Space and Astronomy Centre ESA‐ESAC Madrid Spain

5. Instituto de Astrofísica de Andalucía IAA‐CSIC Granada Spain

6. Instituto de Astrofisica e Ciencias do Espaço Lisbon Portugal

7. European Space Operations Centre ESA‐ESOC Darmstadt Germany

8. School of Physics and Astronomy University of Leicester Leicester UK

9. STI Unit The Abdus Salam International Centre for Theoretical Physics Trieste Italy

Abstract

AbstractSpacecraft‐to‐spacecraft radio occultations experiments are being conducted at Mars between Mars Express (MEX) and Trace Gas Orbiter (TGO), the first ever extensive inter‐spacecraft occultations at a planet other than Earth. Here we present results from the first 83 such occultations, conducted between 2 Nov 2020 and 5th of July 2023. Of these, 44 observations have to‐date resulted in the extraction of vertical electron density profiles. These observations are the successful results of a major feasibility study conducted by the European Space Agency to use pre‐existing relay communication equipment for radio science purposes. Mutual radio occultations have numerous advantages over traditional spacecraft‐to‐ground station occultations. In this work, we demonstrate how raw data are transformed into electron density values and validated with models and other instruments.

Funder

Science and Technology Facilities Council

European Space Agency

Publisher

American Geophysical Union (AGU)

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