1. The Return of the Clouds Are Clouds Self-Organised Critical Systems? Gillian Cupitt

2. The Return of the Clouds What is Self-Organised Criticality? Examining Fractals in clouds Looking for periodicity

3. What is Self-Organised Criticality? Self-Organised Criticality is characterised by Continuous Change High Sensitivity to External conditions Events on all Scales http://www.sst.ph.ic.ac.uk/kim/research/rice.html

4. Self-Organised Criticality Some indicators: Regular distribution of catastrophic events “1/f” noise FRACTALS

5. Fractals Self-Similarity http://vortex.plymouth.edu/clouds.html

6. Fractals Non-linear dimensions 1 D 2 D 1.54 D ?? http://classes.yale.edu/math190a/Fractals.html

7. The Picture http://www.ghcc.msfc.nasa.gov

8. Fractal Analysis

12. OBEYING A POWER LAW

13. Finding the dimension… 1 - D = gradient of line D = 1.1 NOT AN INTEGER!

14. Do All clouds have fractals???

15. D = 1.4

16. PERIODICITY IN CLOUDS  An insight into MATLAB and its errors… PART 2:

17. Fourier Transform

18. Acknowledgements Per Bak, “How nature works”, 1947 Neeraj Sharma, for sharing his ideas and results Iver Cairns for guidance Matlab People who listened to me whinge about Matlab