Comet Siding Spring's influence on the Mars' ionosphere

Olivier Witasse (1) , B. Sánchez-Cano (2) , Gregorio Molina-Cuberos (3) , Pierre-Louis Blelly (4) , M. Lester (2) , François Leblanc (5) , Ronan Modolo (5) , Jean-Yves Chaufray (5) , Guillaume Gronoff (6) , Jared Espley (7) , M. Costa (1) , M. Giuranna (8)

1 ESTEC - European Space Research and Technology Centre
2 Department of Physics and Astronomy [Leicester]
3 Department of Electromagnetism and Electronics [Murcia]
4 IRAP - Institut de recherche en astrophysique et planétologie
5 HELIOS - LATMOS
6 LaRC - NASA Langley Research Center [Hampton]
7 GSFC Planetary Magnetospheres Laboratory
8 INAF - Istituto Nazionale di Astrofisica

On October 19th 2014, Mars experienced a close encounter with Comet C/2013 A1 (Siding Spring), at a distance of ~138,000 km. The coma washed over Mars and the planet passed directly through the cometary debris stream, producing significant effects in Mars' upper atmosphere. We present here an overview of ionospheric measurements performed during the comet encounter with Mars Express, MAVEN, and Mars Reconnaissance Orbiter. We discuss the comet's influence on the ionosphere through different processes that work at different altitudes: magnetospheric disturbances, impact of cometary pickup ions, and deposition of cometary dust.

Domaines: Planète et Univers [physics]

Olivier Witasse, B. Sánchez-Cano, Gregorio Molina-Cuberos, Pierre-Louis Blelly, M. Lester, et al.. Comet Siding Spring's influence on the Mars' ionosphere. European Planetary Science Congress 2017, Sep 2017, Riga, Latvia. pp.EPSC2017-131. ⟨insu-01666361⟩