Objective characterization of stellar activity cycles. I - Methods and solar cycle analyses

Details Objective characterization of stellar activity cycles. I - Methods and solar cycle analyses Objective characterization of stellar activity cycles. I - Methods and solar cycle analyses

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..766g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 15, 1987, p. 766-781. Research supported by the National Geograp

Astronomy and Astrophysics

Astrophysics

37

Chromosphere, Solar Cycles, Stellar Activity, Calcium, Emission Spectra, Late Stars, Long Term Effects, Power Spectra, Solar Corona, Sunspots

Scientific paper

A large set of high-quality chromospheric activity index data of sufficient temporal extent to allow quantitative characterization of stellar cycles now exists thanks to the work, begun two decades ago, by Olin Wilson. In this paper the authors discuss the methods which can be used in analyzing the 18 yr records of Ca II H and K index data. It is shown that derivation of accurate periods and characterization of cycle morphology (ratio of rise to decay time) is possible, but that the background noise, especially the growth and decay of activity, is an important and troublesome factor to consider.

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