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2001 Complex Systems Summer School

Santa Fe Students

Nada Jevtic

I am currently working on a Ph.D. in Physics at the Physics Department of the University of Connecticut. My work at UConn focuses on applying non-linear time-series reconstruction tools to problems in solar physics. Initially we wanted to look at Ca II K data. As a test of the methodology and the software we first analyzed sunspot records. However, recent helioseismological results indicate that not only does the solar dynamo reside in the solar tachocline but a quasiperiodicity at ~16 months is present. In addition, there is possibly another smaller scale near surface dynamo To date most work has been focused on searching for the signature of a longer term dynamo evident in the 11 year solar cycle. . The new results motivated the work that I am currently doing on looking for self-similarity in daily data for the two solar hemispheres separately. Our results on sunspot number data indicate that the maxima and minima differ significantly. However, this may not be the result of a difference in the underlying processes. It is probably due to the definition of the sunspot number and the loss of dynamical range at low sunspot numbers. We plan to look at other indicators of solar activity such as sunspot area and the 10.7 cm flux that do not suffer from this problem.