  We study, by using a wavelet decomposition methodology, the solar signature
on global surface temperature data using the ACRIM total solar irradiance
satellite composite by Willson and Mordvinov. These data present a
+0.047%/decade trend between minima during solar cycles 21-23 (1980-2002). We
estimate that the ACRIM upward trend might have minimally contributed
$\sim$10-30% of the global surface temperature warming over the period
1980-2002.
