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Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity
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UNSPECIFIED (2003) Statistical characterisation of full-disk EUV/XUV solar irradiance and correlation with solar activity. ASTRONOMY & ASTROPHYSICS, 409 (2). L17-L20. doi:10.1051/0004-6361:20031292 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:20031292
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 | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Journal or Publication Title: | ASTRONOMY & ASTROPHYSICS | ||||
Publisher: | E D P SCIENCES | ||||
ISSN: | 0004-6361 | ||||
Official Date: | October 2003 | ||||
Dates: |
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Volume: | 409 | ||||
Number: | 2 | ||||
Number of Pages: | 4 | ||||
Page Range: | L17-L20 | ||||
DOI: | 10.1051/0004-6361:20031292 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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