AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 92. Solar Cycle
Display, Thursday, June 3, 1999, 9:20am-4:00pm, Southeast Exhibit Hall

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[92.10] Observations of Hysteresis Among Indicators of Solar Activity

K. T. Bachmann, A. Ranganath (Birmingham-Southern College)

We show that filtered time series of five indicators of solar activity exhibit significant solar-cycle-dependent differences in their relative variations. This study expands upon previous work by including data from recent NASA missions, indicating that the detected hysteresis patterns continue through the decline of solar cycle 22. Among the indicators that we study, we find that the hysteresis effects are approximately simple phase shifts that we present qualitatively via plots similar to Lissajous figures. These phase shifts correspond to time delays of less than three months behind the leading indicator, the International Sunspot Number, and are small compared to the typical eleven-year solar cycle. We believe that hysteresis represents a real delay in the onset and decline for changing solar emission at various wavelengths. Our research is funded by the Research Corporation and by the NASA Joint Venture (JOVE) program.

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