Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity
UNSPECIFIED. (2003) Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity. ASTRONOMY & ASTROPHYSICS, 409 (2). L17-L20. ISSN 0004-6361Full text not available from this repository.
Official URL: http://dx.doi.org/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.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy|
|Journal or Publication Title:||ASTRONOMY & ASTROPHYSICS|
|Publisher:||E D P SCIENCES|
|Official Date:||October 2003|
|Number of Pages:||4|
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