Conveners
Wednesday Morning
- James Stone (Princeton University)
Neal Turner
(JPL/Caltech)
06/08/2014, 09:00
Workshop Main Programme
I will review the main ionizing processes at work in protostellar and circumplanetary disks, the chemical reactions controlling the recombination, and the resulting distributions of ionization state and conductivity. A small volume near the central star or planet reaches temperatures above 1000 K, hot enough for collisional ionization of the alkali elements. At high mass flow rates and also...
Dr
Shigenobu Hirose
(JAMSTEC)
06/08/2014, 09:45
Workshop Main Programme
In protoplanetary disks, magnetic turbulence driven by MRI is generally suppressed by non-ideal MHD effects due to low ionization fractions. However, thermal ionization may revive ideal MHD in inner radii. To see the effects of thermal ionization, it is crucial to obtain temperatures correctly. For that purpose, we utilize radiation MHD shearing box simulations employing realistic EOS and...
Colin McNally
(NBIA, NBI)
06/08/2014, 10:45
Workshop Main Programme
The magnetorotational instability (MRI) drives magnetized turbulence in sufficiently ionized regions of protoplanetary disks, leading to mass accretion. The dissipation of the potential energy associated with this accretion is a component of the balance which determines the thermal structure of the disk. This is expected to be most significant in the inner regions, at the midplane inside the...
Dr
Satoshi Okuzumi
(Tokyo Institute of Technology)
06/08/2014, 11:15
Workshop Main Programme
Non-ideal MHD effects play crucial roles in magnetohydrodynamics (MHD) of protoplanetary disks. It is conventionally assumed that electric fields in the neutral gas rest frame are so weak that they have no effect on the kinetics of ions and electrons. However, a simple order-of-magnitude estimate shows that comoving electric fields associated with MRI-driven turbulence can be strong enough to...
