Do young Suns undergo magnetic reversals?

Abstract

Abstract.A key part of the modern-day regenerative solar magnetic dynamo is the reversal of the Sun's global magnetic field every eleven years. However, recent theoretical models indicate that young-rapidly rotating Sun-like stars may not always undergo full magnetic reversals, but instead may sometimes undergo "attempted" reversals where the magnetic field declines in strength only to return with the same polarity. Using the technique of Zeeman Doppler imaging we have mapped the magnetic field topology of a small sample of young Sun-like stars at multiple epochs, and present tentative evidence of an "attempted" magnetic field reversal on one of our stars.

The excitation of planetary orbits by stellar jet variability and polarity reversal

“…The mean acceleration is set to zero because we assume that the observed asymmetry in stellar jets is equally time variable in its direction. It is indeed reasonable to assume that an excess of linear momentum loss from one side of the accretion disk may in time be reversed by loss from the other side especially if the asymmetry's origin is related to the magnetic field configuration which may be subject to polarity reversals such as those observed in the solar cycle and other stars (Fares et al 2009;Oláh et al 2009;Petit et al 2009;Ghizaru, Charbonneau, & Smolarkiewicz 2010;Marsden et al 2010;Brown et al 2011;Morgenthaler et al 2011;Poppenhaeger, Günther, & Schmitt 2012).…”