On the Origin of Solar Torsional Oscillations and Extended Solar Cycle. (arXiv:1908.04525v1 [astro-ph.SR])

On the Origin of Solar Torsional Oscillations and Extended Solar Cycle. (arXiv:1908.04525v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Pipin_V/0/1/0/all/0/1">V.V. Pipin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kosovichev_A/0/1/0/all/0/1">A.G. Kosovichev</a>

We present a nonlinear mean-field model of the solar interior dynamics and
dynamo, which reproduces the observed cyclic variations of the global magnetic
field of the Sun, as well as the differential rotation and meridional
circulation. Using this model, we explain, for the first time, the extended
22-year cycle of the solar torsional oscillations, observed as propagation of
zonal variations of the angular velocity from high latitudes to the equator
during the time equal to the full dynamo cycle. Our results show that the
torsional oscillations result from an overlay of dynamo waves propagating in
the bulk of the convection zone. The oscillations are driven by a combinations
of magnetic field effects acting on turbulent angular momentum transport the
dynamo-induced variations of meridional circulation and the large-scale Lorentz
force. They are the primary drivers of the torsional oscillations, and provide
necessary conditions for the extended solar-cycle phenomenon.

We present a nonlinear mean-field model of the solar interior dynamics and
dynamo, which reproduces the observed cyclic variations of the global magnetic
field of the Sun, as well as the differential rotation and meridional
circulation. Using this model, we explain, for the first time, the extended
22-year cycle of the solar torsional oscillations, observed as propagation of
zonal variations of the angular velocity from high latitudes to the equator
during the time equal to the full dynamo cycle. Our results show that the
torsional oscillations result from an overlay of dynamo waves propagating in
the bulk of the convection zone. The oscillations are driven by a combinations
of magnetic field effects acting on turbulent angular momentum transport the
dynamo-induced variations of meridional circulation and the large-scale Lorentz
force. They are the primary drivers of the torsional oscillations, and provide
necessary conditions for the extended solar-cycle phenomenon.

http://arxiv.org/icons/sfx.gif

Comments are closed.