[IGPP Everyone] Fwd: Final Space Physics Seminar, Fri. 12/08 3:30pm: New 1D modeling of the coronal heating and solar wind acceleration including both shock and turbulence heating

[MARCO VELLI]

New 1D modeling of the coronal heating and solar wind acceleration
including both shock and turbulence heating

Munehito Shoda
University of Tokyo


We propose a novel one-dimensional model that includes both shock and
turbulence heating and qualify how these processes contribute to heating
the corona and driving the solar wind. Compressible MHD simulations allow
us to automatically consider shock formation and dissipation, while
turbulent dissipation is modeled via a one-point closure based on Alfven
wave turbulence. Numerical simulations were conducted with different
photospheric perpendicular correlation lengths L_0, which is a critical
parameter of Alfven wave turbulence, and different root-mean-square
photospheric transverse-wave amplitudes dv_0. For the various L_0, we
obtain a low-temperature chromosphere, high-temperature corona, and
supersonic solar wind. Our analysis shows that turbulence heating is always
dominant when L_0 < 1 Mm. This result does not mean that we can ignore the
compressibility because the analysis indicates that the compressible waves
and their associated density fluctuations enhance the Alfven wave
reflection and therefore the turbulence heating. The density  fluctuation
and the cross helicity are strongly affected by , while the coronal
temperature and mass loss rate depend weakly on L_0.

*Friday, December 8, 2017*
*Room 6704 Geology*
*3:30 - 5:00 PM*
In Charge
M. Velli

After the seminar, in addition to our usual treats, we will have Panettone
and bubbly to celebrate the end of term and energize those working hard on
completing their AGU talks and posters !
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