At first sight this Brazilan paper in Astronomy & Astrophysics is relatively uninteresting if you are familar with sunspot activity, appears to be another general look using waveletts.
Two features strike me as worthy of highlighting
- a double burst of activity during cycle 23, not obvious from sunspot data alone
- continuing activity right through the 23/24 transition
Extract from paper Fig. 5, my highlight of strong X activity post the cycle 23 sunspot peak.
Wavelet analysis of CME, X-ray flare, and sunspot series
M. R. G. Guedes, E. S. Pereira and J. R. Cecatto
A&A 573 A64 (2015)
(access with registration, large PDF 17.7MB)
First part of Abstract.
Context. Coronal mass ejections (CMEs) and solar flares are the most energetic transient phenomena taking place at the Sun. Together they are principally responsible for disturbances in outer geospace. Coronal mass ejections and solar flares are believed to be correlated with the solar cycle, which is mainly characterized by sunspot numbers.
Aims. Here, we search for pattern identification in CMEs, X-ray solar flares, and sunspot number time series using a new data mining process and a quantitative procedure to correlate these series.
The top figure is particularly interesting to me given some history, not all known to Talkshop readers. Some time ago I got involved in a minor disagreement with LS. over a work where he made a fuss about a satellite very short wave dataset which seemed to him to show the satellite instrumentation was failing. To his credit he did publish what the satellite data keepers had to say, firmly disagreed. I am not aware of a definite conclusion.
I reworked roughly what LS had done but to high resolution, disagreeing further with what had been said. The data indicated a peculiar rise in solar output which I noted as an open wondering seemed to coincide with excess Arctic ice loss. The whole of cycle 23 at that time seemed to be unusual.
I don’t get into fights, waste of effort, so it was all left as a wondering. Maybe I did post something on this, don’t recall.
See why the plot now tweaks my interest? If true this might have implications for earth data.
Extract from paper Fig. 3 implying CME activity tended to be contiguous across cycle 23/24, although the paper coda about dataset usage should be noted.
There is no particular conclusion more than pointing out what I am seeing.
Post by Tim