Large-scale Magnetic Fields and Mass Flows in
Solar Interior - Are Hot Spots and Coronal Hole Related?
M. Ryutova
In collaboration with P. Scherrer, T. Bai, and T. Hoeksema
The observed regularities of Hot Spots indicate that their origin must
be connected with the processes in the deep layers below the
visible surface. On the other hand, flare activity is
directly connected with conditions on the solar surface and subsurface
regions, namely with the specific of the distribution of magnetic
"foot-points" and the patterns of mass flows (at different spatial scales),
in other words the mechanism and the efficiency of the energy transfer
from lower to upper layers of solar atmosphere strongly depend on the
topology of magnetic field and "organization" of mass flows at solar surface.
To understand these processes we need to analyze MDI Dopplergrams and
magnetograms corresponding to those regions which correspond to locations
of hot spots. In addition, we will analyze the underlying regions
corresponding to the current coronal hole. Although these two regions have
the opposite "activity" in corona, they have several common features
which is one of the subject of our investigation: (1) both events have a
preferable longitudinal location, (2) both have the clear "north- south"
asymmetry, (3) the rotation of the hot spots and the coronal hole seem to
be that of rigid ; (4) both events seem to be an intrinsic features
of the solar interior (given their time-scales extend to several solar
cycles). The search for the possible relation between these two
global events is new and with MDI data seems feasible. We intend also to
complement these studies by time-distance analysis which will give
the reconstructed topology of subsarface regions. Theoretical study
is based on the model of nonlinear oscillator with the
source and a sink of energy; we plan to adjust free parameters of the
model using the observational signatures.