Statistics – Computation
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hrxs.confe..13d&link_type=abstract
"High Resolution X-ray Spectroscopy: Towards IXO, Proceedings of the international workshop held at the Mullard Space Science La
Statistics
Computation
Scientific paper
Remote plasma diagnostics is an important tool for astrophysical studies. In order to fully utilize its power, a detailed knowledge of the properties of the atomic processes which give rise to the observable emission is essential. However, retrieving this information to the necessary accuracy, either by theoretical computation or by laboratory experiments, is often a challenging task. In this context, the X-ray emission of comets provides a welcome opportunity for checking and improving our knowledge of basic atomic quantities. Cometary X-ray emission is the result of charge exchange processes between highly ionized heavy atoms in the solar wind and neutrals in the cometary coma - a textbook example of an interaction between a highly ionized plasma and cold gas far from thermal equilibrium, which takes place in a huge, clean 'laboratory' fairly nearby. Thus, cometary X-ray spectra do not only provide information about the elusive properties of the heavy ion content of the solar wind over the solar cycle and in three dimensions, but are also valuable for plasma diagnostics in general.
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