Skip to Main content Skip to Navigation
Journal articles

Cometary sputtering of the Martian atmosphere during the Siding Spring encounter

Yung-Ching Wang 1, 2 Janet G. Luhmann 1 Ali Rahmati 3 François Leblanc 4 Robert E. Johnson 5 Thomas E. Cravens 3 Wing-Huen Ip 6
1 SSL - Space Sciences Laboratory [Berkeley]
2 SSI - Space Science Institute [Macau]
3 Department of Physics and Astronomy [Lawrence Kansas]
4 HEPPI - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
5 Engineering Physics Program [Charlottesville]
6 IANCU - Institute of Astronomy [Taiwan]
Abstract : With the approach of the close encounter of comet Siding Spring with Mars, possible influences on the Martian atmosphere from the cometary coma are being explored. Here we describe the non-thermal atmospheric loss due to atmospheric sputtering produced by the impact of the coma material. We use an atmospheric sputtering model to simulate the effect of the incident neutral O and the pickup O+, produced by photodissociation of water and its products. With the relatively large encounter speed of 56 km/s at a close flyby altitude of ∼ 130,000 km, the sputtering escape rates from the coma can reach 2 to 3 times the incident gas fluxes. Thus, the passing of the cometary coma will lead to removal of Martian atmosphere instead of mass loading. If the cometary outgassing rate reaches 10View the MathML source the sputtering from the extended coma could remove about 10 tons of Martian gases and deposit about 1 ton of external cometary material into the atmosphere during the one hour encounter. This implies that the cometary sputtering may have played a non-negligible role in Mars atmospheric evolution when this kind of cometary encounter may occur frequently in early Martian epochs.
Keywords : Comet Mars Terrestrial planets atmosphere
Document type :
Journal articles
Complete list of metadatas
https://hal-insu.archives-ouvertes.fr/insu-01286152
Contributor : Catherine Cardon <>
Submitted on : Thursday, March 10, 2016 - 1:29:07 PM
Last modification on : Thursday, September 10, 2020 - 2:04:14 PM

Identifiers

Collections

INSU | CNRS | UPMC | UVSQ | LATMOS | UNIV-PARIS-SACLAY | SORBONNE-UNIVERSITE | SU-SCIENCES

Citation

Yung-Ching Wang, Janet G. Luhmann, Ali Rahmati, François Leblanc, Robert E. Johnson, et al.. Cometary sputtering of the Martian atmosphere during the Siding Spring encounter. Icarus, Elsevier, 2016, 272, pp.301-308. ⟨10.1016/j.icarus.2016.02.040⟩. ⟨insu-01286152⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

256