Category Archives: cycles-Analysis

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

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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A Cycles Analysis Approach to Predicting Solar Activity

In desperation I asked Fermi whether he was not impressed by the agreement between our calculated numbers and his measured numbers. He replied, “How many arbitrary parameters did you use for your calculations?” I thought for a moment about our … Continue reading

Posted in astronomy-Planets, astronomy-Solar, climate-Solar, cycles-Analysis, Cycles-General, cycles-Prediction | 1 Comment

CATS Training Seminar 4 – Cycles Analysis & Projection

The 4th CATS (Cycles Analysis & Time Series) Software Training Session video is now available at Vimeo at: http://vimeo.com/groups/cycles It deals with how to use the spectrum analysis to find cycles periods and to fit them to the data and … Continue reading

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AORD cycle of 1884 days (62 months)

I received an email from Jeff Connell in Australia which I quote here with his permission: I don’t know whether this comes across as “teaching your grandmother how to suck eggs”, as you are the master, but as a thank … Continue reading

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The Lambda Function

Several papers by Stephen J Taylor and Brian G Kingsma, “Non-stationarity in Sugar Prices” http://www.jstor.org/pss/3009471 and “An Analysis of the Variance and Distribution of Commodity Price Changes” deal with a method of pre-processing price data which is suitable for many … Continue reading

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Vaal River Flow Cycles

Fluctuations in river flows are important as they affect irrigation and therefore the livelihood of people. The Vaal river in South Africa is and important water source in the region and was studied by Alexander et al (Journal of the … Continue reading

Posted in Climate-General, climate-Weather, cycles-Analysis, cycles-Prediction | Tagged , , , , , , , | 2 Comments

CATS Version 1.0 and Training Seminars

CATS training seminars will be commencing this week. If you wish to attend them, then your details should be sent to us in advance. Please respond to admin(at)cyclesresearchinstitute(dot)org stating that you wish to attend. There are limited positions still available. … Continue reading

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