These lecture notes are a compilation of various
material that I largely produced by myself, with
some contributions from Helen Mason (DAMTP).
For further details, see
e.g.: Mason and Monsignori Fossi (1994);
my PhD Thesis, available on-line at:
http://www.damtp.cam.ac.uk/user/astro/gd232/astro.html
Del Zanna et al. (2002),
and the CHIANTI user guides that I wrote, which can be
found in the WWW pages, e.g.:
http://www.chianti.rl.ac.uk/
and, of course, all the references therein.
