Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..636..144s&link_type=abstract
AIP Conference Proceedings, vol. 636, iss. no. 1, p. 144-153
Physics
1
Charge Exchange, Charge Transfer, Cometary Atmospheres, Comets, Emission Spectra, Models, Radiative Transfer, Solar Wind, Space Plasmas, X Ray Spectra, X Rays, Emission, Absorption, And Scattering Of Electromagnetic Radiation, Heliopause And Solar Wind Termination, Atomic And Molecular Data, Spectra, And Spectral Parameters
Scientific paper
The emission of x-rays has been observed from nearly twenty comets and evidence exists that it is the result of radiative decays from highly-excited, highly-charged solar wind ions following charge exchange with neutral species, mostly water, in the cometary atmosphere. We review the progress to date in constructing models of the x-ray emission. However, the construction of accurate models is impeded by the near lack of reliable state-selective charge exchange cross section data for the relevant neutral species (H2O, CO, CO2, etc.). The progress, and difficulties, of theoretical studies for the relevant collision processes is discussed with a particular focus on the breakdown of approximations made in the emission models.
Ali Rafia
Raković M. J.
Schultz David R.
Stancil Phillip C.
Wang Gou-Jen
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