- Conference date: 15-19 October 2006
- Location: Meudon (France)
Soft X‐ray emission due to charge exchange (CX) between solar wind highly charged ions and atoms and molecules has recently been recognized to occur in a number of solar system objects. Here I present measurements and modelling of CX X‐ray emission around comets, planets, and within the heliosphere (the cavity carved by the solar wind in the interstellar medium). This latter omni‐directionnel emission is due to the interaction between solar wind ions and the flow of interstellar neutrals. It has now been found to be responsible for a large fraction of (if not all) the emission previously attributed to the Local Interstellar Hot Bubble (a 100 parsecs cavity around the Sun supposed to be filled with one million K gas). I also argue for me existence of CX X‐ray emission in galaxies. Because new X‐ray satellites have sufficient sensitivity and spectral resolution to detect the signatures of the CX lines, there is a strong need for theoretical work on CX state‐selective population cross‐sections and ion radiative transition probabilities, their dependence on the interacting species and the collisional energy.
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