1307.1086 (Sverre Holm)

On the alleged coherence between the global temperature and the sun's movement    [PDF]

Sverre Holm

It has recently been claimed that there is significant coherence between the spectral peaks of the global temperature series over the last 160 years and those of the speed of the solar center of mass at periods of 10-10.5, 20-21, 30 and 60-62 years. Here it is shown that these claims are based on a comparison between spectral peaks in spectral estimates that assume that the global temperature data contains time-invariant spectral lines. However, time-frequency analysis using both windowed periodograms and the maximum entropy method show that this is not the case. An estimate of the magnitude squared coherence shows instead that under certain conditions only coherence at a period of about 17 years can be found in the data. As this periodicity is unwarranted from any physical model it is doubtful whether it is physically significant.

View original: http://arxiv.org/abs/1307.1086