Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity

Details Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity

2003-02-14

arxiv.org/abs/astro-ph/0302277v2

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures; v.2 R-squared goodness of fits added

Scientific paper

10.1051/0004-6361:20031292

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(T)=1.5 +/- 0.1; (ii) during the low-activity period 1996 Jan-June a(T)=3.0 +/- 0.2; and (iii) in general a(T) decreases with increasing activity.

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