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The History of Activity of the Sun and its Rotational Period on the ZAMS

Published online by Cambridge University Press:  12 April 2016

Kazimierz Stępień
Kazimierz Stępień*
Affiliation:
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

Abstract

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The rotation period of the Sun after it reached ZAMS is estimated from the present rotation rate, average X-ray emission flux and average calcium emission flux. Taking into account all existing uncertainties it is concluded that this initial period was within the range 1–9 days, with the most probable value 2–3 days. Possible influence of the solar activity on evolution of life on the Earth is briefly discussed.

Type
Part III Solar magnetism and large-scale flows
Information
International Astronomical Union Colloquium , Volume 130: The Sun and Cool Stars: activity, magnetism, dynamos , 1991 , pp. 288 - 293
Copyright
Copyright © Springer-Verlag 1991

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