Past and future trends in stellar activity cycle research: beyond Ca II H&K

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Stellar Activity Cycles

Scientific paper

Olin C. Wilson began stellar activity cycle research in 1966, and work has since proceeded along a number of observational and theoretical lines. Long-term ground-based spectroscopic monitoring of the Ca II H&K activity proxies has demonstrated the existence of varying types of stellar cycles, while complementary photometric studies have revealed luminosity variations both in phase and in antiphase with chromospheric activity. Beginning in the late 1970s, space-based observations greatly affected our understanding of stellar chromospheres, spurring a complementary evolution in interpretation of the ground-based results. Excellent recent reviews of the results of these programs have appeared, so in this paper, I will summarize the results and review them in the broad context of the development of our present state of knowledge, current outstanding questions and pitfalls facing workers in the field today, and the lines of investigation likely to be fruitful in the next decade.

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