Thomas Duvall
(MPS Gottingen)
3/9/15, 11:10 AM
Recent results on convection zone flows will be examined,
including
the depth structure of supergranulation, the effect of the
Coriolis force
on supergranular flows, and upper limits on the amplitude of
convection
at different depths.
Atefeh Barekat
(Max-Planck-Institut für Sonnensystemforschung (MPS))
3/9/15, 11:50 AM
Helioseismology has provided unprecedented information about
the internal rotation of the Sun. One of the important
achievements was the discovery of two radial shear layers:
one near the bottom of the convection zone (the tachocline)
and one near the surface. These shear layers may be
important ingredients for explaining the magnetic cycle of
the Sun. We measure the logarithmic radial...
Nathan Kleeorin
(Ben-Gurion University of the Negev)
3/9/15, 12:10 PM
A one-dimensional nonlinear dynamo model (no R-model) is
used for prediction of solar activity (Wolf numbers). The
nonlinearity includes the dynamical equation for the
magnetic helicity (the magnetic part of the alpha effect)
and algebraic nonlinearity of the total alpha effect. The
diffusion flux of magnetic helicity is taken into account.
The Gnevyshev-Ohl rule works when only the...
Mei Zhang
(National Astronomical Observatory of China)
3/9/15, 12:40 PM
We present our observations on current and kinetic
helicities that provide constrains on solar dynamo models.
We find that: (1) Current helicity in active regions present
a clear hemispheric helicity sign rule but this rule also
shows a solar-cycle variation. (2) Strong and weak magnetic
fields show opposite helicity signs in active regions and
this property may also has a solar-cycle...
