Fig. 1
Example of spot-dominated total solar irradiance (TSI) variability. Panel a: SORCE/TIM measurements from 28-Nov.-2006 to 28-Feb.-2007. Purple and orange curves indicate sine-wave functions with periods of 27.3 d (solar rotation period deduced with the generalised Lomb Scargle periodogram method, GLS) and 26.6 d (solar rotation period deduced with the gradient of power spectra method, GPS). Panels b and c: corresponding GLS periodogram and auto-correlation function, ACF, respectively. Panel d: global wavelet power spectrum, PS, calculated with the 6th order Paul wavelet. Panel e: gradient of the power spectrum plotted in panel d. Blue asterisks in panels b and c represent positions of the peaks in theGLS and ACF. Green dotted lines in panel e indicate the high- and low-frequency inflection points.
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