[IGPP Everyone] 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]

REMINDER: In two hours!

New 1D modeling of 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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