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K. T. Bachmann, K. Nautiyal, V. te Velde (Oklahoma School of Science and Mathematics)
We pass several well-known, long-term indicators of solar activity through a two-year Gaussian filter in order to remove all variations except those related to the overall 11-year solar-activity cycle. When plotting these filtered time sequences against each other, we see loop-like structures indicating that some indices lead others by time periods from a few days up to few months. We organize these so-called hysteresis plots into single loops spanning time periods from solar minimum to solar minimum, and we use the 10.7-cm flux as a comparison standard.
The analysis of our hysteresis plots includes (1) systematic computation and tabulation of lead times in days as a function of solar cycle number and (2) presentation of evidence that the current solar cycle is developing in a different manner than the previous four cycles. We discuss the consistency of measured lead times over two to four solar cycles, and we relate these times to short-term temporal variations and to physical processes in the solar atmosphere.
The author(s) of this abstract have provided an email address for comments about the abstract: kbachman@ossm.edu
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.