Morgan - Lassen's work (who, by the way, is Dr. Knud Lassen, with theDanish Meteorological Institute, Solar-Terrestrial Physics Division) is hosted on the tgmnow site, in more of an archival sense. Dr. Lassen's work on the relationship between climate and solar activity (not just solar irradiance, but total activity) has been widely published. Here are a couple of references. I trust that you're able to visit your university library and look them up.

[Friis-Christensen and Lassen, 1991] Friis-Christensen, E. and Lassen, K. (1991). Length of the Solar Cycle: An indicator of Solar Activity Closely Associated with Climate. Science, 254:698-700.

[Lassen and Friis-Christensen, 1995] Lassen, K. and Friis-Christensen, E. (1995). Variability of the solar cycle length during the past five centuries and the apparent association with terrestrial climate. Journal of Atmospheric and Terrestrial Physics, 57:835-845.

[Thejll and Lassen, 2000] Thejll, P. and Lassen, K. (2000). Solar forcing of the northern hemisphere land air temperature: New data. Journal of Atmospheric and Terrestrial Physics, 62:1207-1213.


If you want to read up on the relationship between solar activity and climate, here's a list of papers by real PhDs, doing real science, published in real peer review journals. It was put together by Peter Thejil. Dr. Peter Thejil is with the Danish Meteorological Institute in the Atmosphere & Space Research Division (those damn Danes eh?)

http://arxiv.org/PS_cache/physics/pdf/0106/0106033.pdf


Here's a particularly good one, it's on the relationship between cosmic rays and global temperature. It was done by Dr Nir Shaviv and Dr. Jan Veizer - published in GSA Today (the Geological Society of America's journal)

http://www.phys.huji.ac.il/~shaviv/Ice-ages/GSAToday.pdf