Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sosyr..43..410k&link_type=abstract
Solar System Research, Volume 43, Issue 5, pp.410-433
Astronomy and Astrophysics
Astrophysics
Scientific paper
In the framework of the basic cosmogony problem related with the reconstruction of the solar protoplanetary disk at the early stages of its existence, a closed system of magnetohydrodynamic equations with the scale of average motion is formulated in the approximation of single-fluid magnetic hydrodynamics; this system is designated for setting and numerically solving various problems on the self-consistent simulation of the structure and evolution of the disk and related corona. The influence of both the axially symmetric magnetic field of the proto-Sun and the large-scale field generated by the turbulent dynamo mechanism on the disk structure formation is analyzed. A new approach to the simulation of the turbulent transport coefficient in the weakly ionized disk is developed. This approach provides an account of the effects of the influence of the generated magnetic field and the processes of convective heat transport on turbulence development in the stratified layer with finite thickness and, thus, rejects the Shakura-Sunyaev α formalism widely used in astrophysical literature. The mathematical model of a thin (but optically thick) non-Keplerian disk taking into account the turbulence dissipation due to kinematical and magnetic viscosity, medium opacity, accretion from ambient space, the action of a turbulent αω dynamo on the magnetic field generation, the magnetic force and energy interaction between the disk and its corona, etc., is discussed. This study is the continuation of the stochastic-thermodynamic approach to the description of turbulence of astro-geophysical systems developed by us in a number of papers [Kolesnichenko 2000, 2001, 2003, 2004, 2005; Kolesnichenko, Marov 2006, 2007, 2008; Marov, Kolesnichenko 2002, 2006].
Kolesnichenko Aleksander V.
Ya Marov Mikhail
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