On Stellar Activity Cycles
Abstract
The relation between the average magnetic fieldB, the angular velocity Ω, and the periodP of stellar activity cycles is studied. For the calculations we have used Leighton's (1969) model for the solar cycle with the additional assumption that the differential rotation and the cyclonic turbulence (Parker, 1955) (that is the ‘sunspot tilt’ or the ‘αeffect’) are both proportional to Ω. We then find thatB is roughly proportional to Ω and thatP decreases with increasing Ω. The period of the solar cycle increases therefore with the age of the Sun.
 Publication:

Astrophysics and Space Science
 Pub Date:
 February 1972
 DOI:
 10.1007/BF00649924
 Bibcode:
 1972Ap&SS..15..307D