AAS 204th Meeting, June 2004
Session 37 Solar Magnetic Fields and the Photosphere
SPD Poster, Tuesday, June 1, 2004, 10:00am-7:00pm, Ballroom

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[37.13] Long-Term and Short-Term Temporal Offsets Among Solar-Activity Indicators

K. T. Bachmann, W. R. Ketchum (OSSM)

There is strong evidence indicating that solar activity indicators exhibit temporal relationships, summarized in a basic manner as time delays of indicators of the upper solar atmosphere versus indicators related to the solar photosphere. These time delays have magnitudes on the order of several weeks, are possibly solar-cycle-dependent, and arise from time differences in the development of source regions responsible for each indicator.

We test the hypothesis that a portion of the solar-cycle variability of an indicator is a long-term average of short-term effects due to the eruption and decay of many active regions during the course of a solar cycle and the corresponding diffusion of active-region magnetic flux into the surrounding active network. Based upon our correlation and power spectral analyses of five standard long-term solar activity indices, we suggest instead that solar-cycle temporal offsets are caused more by global changes of the active network than to diffusion of magnetic flux.

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