<a href="http://vestige.lmsal.com/TRACE">TRACE</a> is the first NASA spacecraft I know of that offers its data free to everybody immediately. From their website you can search their database and get the same kind of data that we solar physicists get -- that's how we get it, too.
<p>If you want to work with the data, a fine tool to do so is <a href="http://pdl.perl.org">PDL</a>, a variant of perl that's designed for high powered data analysis.