UNSPECIFIED. (2003) Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity. ASTRONOMY & ASTROPHYSICS, 409 (2). L17-L20. ISSN 0004-6361

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Abstract

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
ISSN:	0004-6361
Date:	October 2003
Volume:	409
Number:	2
Number of Pages:	4
Page Range:	L17-L20
Identification Number:	10.1051/0004-6361:20031292
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/9311

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