Europlanet Science Congress 2021
Virtual meeting
13 – 24 September 2021
Europlanet Science Congress 2021
Virtual meeting
13 September – 24 September 2021
EPSC Abstracts
Vol. 15, EPSC2021-7, 2021
https://doi.org/10.5194/epsc2021-7
European Planetary Science Congress 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

A new type of cloud discovered from Earth in the upper Martian atmosphere

Jean Lilensten1, Jean-Luc Dauvergne2, Christophe Pellier3, Marc Delcroix4, Emmanuel Beaudoin5, Mathieu Vincendon6, Emil Kraaikamp7, Guillaume Bertrand8, Clyde Foster9, Christopher Go10, Μanos Kardasis11, Alexei Pace12, Damian Peach13, Anthony Wesley14, Evangelia Samara15, Stefaan Poedts16, and Francois Colas17
Jean Lilensten et al.
  • 1CNRS/IPAG, Institute of Planetology and Astrophysics in Grenoble (IPAG), Grenoble cedex 9, France (jean.lilensten@univ-grenoble-alpes.fr)
  • 2Société de Planétologie des Pyrénées (S2P) 5 rue Gazan, 75014 Paris, France
  • 3Commission des Observations planétaires, Société Astronomique de France, 3, rue Beethoven, 75016 Paris, France
  • 4Commission des Observations planétaires, Société Astronomique de France, 3, rue Beethoven, 75016 Paris, France
  • 5Université Paris-Saclay, LPS (UMR8502), 510 Rue André Rivière, 91400 Orsay, France
  • 6Institut d’Astrophysique Spatiale, Université Paris Saclay, Orsay, France
  • 7Royal Observatory of Belgium, Avenue Circulaire 3, 1180, Brussels, Belgium
  • 8Commission des Observations planétaires, Société Astronomique de France, 3, rue Beethoven, 75016 Paris, France
  • 9Astronomical Society of Southern Africa, Centurion, South Africa
  • 10University of San Carlos - Physics Department, Nasipit, Talamban, Cebu City, Philippines
  • 11Hellenic Amateur Astronomy Association, Alopekis 42, 10676, Athens, Greece
  • 12Canopus Observatory, Ir-Rabat, Malta
  • 13British Astronomical Association, Burlington House, Piccadilly, London W1J 0DU, UK
  • 14Astronomical Society of Australia, PO Box 145 Rubyvale QLD 4702, Australia
  • 15Royal Observatory of Belgium, Avenue Circulaire 3, 1180, Brussels, Belgium
  • 16Dept. Mathematics / Centre for mathematical Plasma Astrophysics Celestijnenlaan 200B - B-3001 Leuven, Belgium
  • 17IMCCE, Observatoire de Paris, PSL Research University, CNRS UMR 8028, Sorbonne Université, 77 av. Denfert-Rochereau, 75014, Paris, France

During the 2020 Mars opposition, we observe from Earth the occurrence of a non-typical large-scale high-altitude clouds system, extending over thousands of km from the equator to 50°S. Over 3 hours, they emerge from the night side at an altitude of 90 (-15/+30) km and progressively dissipate in the dayside. They occur at a solar longitude of 316°, west of the magnetic anomaly and concomitantly to a regional dust storm. Despite their high altitude, they are composed of relatively large particles, suggesting a probable CO2 ice composition, although H2O cannot be totally excluded. Such ice clouds were not reported previously. We discuss the formation of this new type of clouds and suggest a possible nucleation from cosmic particle precipitation.

How to cite: Lilensten, J., Dauvergne, J.-L., Pellier, C., Delcroix, M., Beaudoin, E., Vincendon, M., Kraaikamp, E., Bertrand, G., Foster, C., Go, C., Kardasis, Μ., Pace, A., Peach, D., Wesley, A., Samara, E., Poedts, S., and Colas, F.: A new type of cloud discovered from Earth in the upper Martian atmosphere, European Planetary Science Congress 2021, online, 13–24 Sep 2021, EPSC2021-7, https://doi.org/10.5194/epsc2021-7, 2021.

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