Hybrid simulations of small planets and planetary moons - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2013

Hybrid simulations of small planets and planetary moons

Résumé

This tutorial is an introduction to the hybrid modeling of the interactions of small planetary objects (planets or moons) with their surrounding plasmas. This presentation will not discuss per se the various hybrid schemes used in plasma physics from a numerical analysis point of view but will rather be focused on the modeling and implementation of the main physical phenomena involved in these interactions. The plasma surrounding the planetary object is either the solar wind or a magnetospheric plasma and the corresponding flow is either super or subcritical leading or not to the formation of a bow shock upstream of the obstacle. The required external boundary conditions will be briefly discussed. The object itself may possess an intrinsic magnetic field driven by a dynamo or a fossile field: we will discuss how to handle this field. The object may possess a more or less dense atmosphere requiring to implement the ion photoproduction by taking into account the photoabsorption. If a dense atmosphere is present it is necessary to modelize its effects on the dynamics of energetic particles. If an ionosphere is present it may involve a complex chemistry requiring a simplified model to produce the main escaping species. At last the object may have an ordinary exosphere fed by its atmosphere or a surface bounded exosphere requiring specific models. The implementation of the main processes coupling the neutral species and the plasma - photoionization, electron impacts and charge exchange reactions – will be discussed. The examples of Mercury, Mars and Titan will support and illustrate these discussions. Another aim of this presentation is to show what can be inferred about a planetary environment like the Martian one by means of global three-dimensional simulations combining a self-consistent hybrid simulation model with a variety of derived models involving test particles.
Fichier non déposé

Dates et versions

hal-02752256 , version 1 (03-06-2020)

Identifiants

  • HAL Id : hal-02752256 , version 1

Citer

Gérard Chanteur. Hybrid simulations of small planets and planetary moons. Hybrid simulations of small planets and planetary moons, Jul 2013, Taiwan, Taipeh, National Central University, Unknown Region. ⟨hal-02752256⟩
18 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More