Astronomical Institutions and Observatories
Solar
The
Solar Data Analysis Center
(SDAC) at Goddard has a home page with all sorts of Solar stuff on it - images, IDL routines, and data for a number of satellites and detectors.
Also at SDAC, the
Solar Physics division
of the
AAS
has a home page.
The NOAA
NGDC
(National Geophysical Data Center)
Solar-Terrestrial Physics division
has a large archive of historical solar data.
The
Big Bear solar observatory
.