Category Archives: cycles-Analysis

Cycles – analysis: finding cycles periods present in time series includes Fourier analysis, spectral analysis, MESA, etc.

Cycles in the New Zealand Economy

(originally posted 02/05/07 on Wobbly Universe blog by Ray Tomes) Although I had been somewhat interested in cycles before 1978, that was the year when I began doing economic modelling on a computer and some cycles just jumped out at … Continue reading

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3.029 and 3.606 minute cycles in Solar Wind Speed

The ACE satellite measures the solar wind speed (among other things) of particles traveling from the Sun towards the Earth. Located at the L1 libration point it is always around 1.5 million km in the direction of the Sun and … Continue reading

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Sunspot Number reconstruction by Leif Svalgaard and proxy cycles of 104 and 208 years

In an article on WUWT, “Solar Activity – Past, Present, Future“, Leif Svalgaard describes the problems of historical sunspot records because of changes in instrumentation and observers. He produces a new series which attempts to correct for the various problems. He … Continue reading

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When minor planets Ceres and Vesta rock the Earth into chaos

Jacques Laskar and colleagues have been leaders in the field of long term solar system planetary motion calculations. Their earlier efforts have produced calculations of the solar system motions for more than 20 million years. These motions are important because … Continue reading

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Analysis of BE10 records as a Solar Irradiance Proxy

Recently on CRI an article on Which Causes which out of Atmospheric Temperature and CO2 content? was posted, and this was circulated to other blogs and much interesting discussion ensued, particularly on TallBloke’s Talkshop. This discussion raised the Cycles in Sunspot Number … Continue reading

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Comparison of correlation analysis techniques for irregularly sampled time series

When dealing with time series we do not always have the luxury of evenly spaced points in time. Particularly for data from geology and related areas the data sampling may be based on depth of core or some such measurement … Continue reading

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Harmonically Related Solar Cycles in UV

There are many reported cycles in the Sun ranging from long to short periods, and often periods found are harmonically related to each other. Sometimes the reasons for this rather obvious, but at other times the related cycles have appeared … Continue reading

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