Solar wind charge exchange X-ray emission from Mars. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2012

Solar wind charge exchange X-ray emission from Mars.

Dimitra Koutroumpa
Ronan Modolo
  • Fonction : Auteur
  • PersonId : 916163
Jean-Yves Chaufray

Résumé

We study the soft X-ray emission induced by charge exchange (CX) collisions between solar-wind, highly charged ions and neutral atoms of the Martian exosphere. A 3D multi species hybrid simulation model with improved spatial resolution (130 km) is used to describe the interaction between the solar wind and the Martian neutrals. We calculated velocity and density distributions of the solar wind plasma in the Martian environment with realistic planetary ions description, using spherically symmetric exospheric H and O profiles. Following that, a 3D test-particle model was developed to compute the X-ray emission produced by CX collisions between neutrals and solar wind minor ions. The model results are compared to XMM-Newton observations of Mars. We calculate projected X-ray emission maps for the XMM-Newton observing conditions and demonstrate how the X-ray emission reflects the Martian electromagnetic structure in accordance with the observed X-ray images. Our maps confirm that X-ray images are a powerful tool for the study of solar wind - planetary interfaces. However, the simulation results reveal several quantitative discrepancies compared to the observations. Typical solar wind and neutral coronae conditions corresponding to the 2003 observation period of Mars cannot reproduce the high luminosity or the corresponding very extended halo observed with XMM-Newton. Potential explanations of these discrepancies are discussed.
Fichier principal
Vignette du fichier
aa19720-12.pdf (764.79 Ko) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-00731069 , version 1 (02-09-2020)

Identifiants

Citer

Dimitra Koutroumpa, Ronan Modolo, Gérard Chanteur, Jean-Yves Chaufray, V. Kharchenko, et al.. Solar wind charge exchange X-ray emission from Mars.: Model and data comparison. Astronomy and Astrophysics - A&A, 2012, 545, pp.A153. ⟨10.1051/0004-6361/201219720⟩. ⟨hal-00731069⟩
284 Consultations
48 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More