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| - Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity
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| - We investigate the distribution of fluctuations in solar irradiance when integrated over the full disk, obtained using extreme ultraviolet/soft X-ray observations from the SOHO CELIAS/SEM instrument. This time series sums over both the contributions of single distinguishable flares, and of many other processes. By detrending we select events with timescales of less than a few hours such as waves, slow flows, and CMEs. The statistics generated by this range of phenomena can be characterised by power-law-tailed distributions. We show that (i) during the high activity period 2000 Jan.-June the tail exponent $a_{\rm T}=1.5\pm0.1$; (ii) during the low activity period 1996 Jan.-June $a_{\rm T}=3.0\pm0.2$; and (iii) in general aT decreases with increasing activity.
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