[Mesa-users] Magnetic diffusivity

[Francis Timmes]

welcome. 

matteo's response was also useful.

fxt



> On Mar 22, 2019, at 2:06 PM, Pedro Nuno David Gomes <pedro.david.gomes at ist.utl.pt> wrote:
> 
> A 2019-03-21 18:06, Francis Timmes escreveu:
>> not to my knowledge, but the electrical conductivity
>> could be calculated in your run_star_extras.
>> sigma_cond = n_e * e^2 / (m_e * f_c)
>> where n_e is the free electron number density (= ye * rho * N_A),
>> e is the charge, m_e is the electron mass, and and f_c is the
>> relevant collision frequency. for example, the classic plasma
>> electron collision rate is f_{e,c} ~ 3e-6 * n_e * ln(lambda) * T^{-3/2} [1/sec],
>> where lambda is the coulomb logarithm ~10.
>> fxt
>>> On Mar 21, 2019, at 9:40 AM, Pedro Nuno David Gomes via Mesa-users <mesa-users at lists.mesastar.org> wrote:
>>> Dear MESA users,
>>> Is there any module in MESA capable of calculating the magnetic diffusivity η (or the electrical conductivity)?
>>> Thank you very much for your attention. Best regards,
>>> Pedro
>>> _______________________________________________
>>> mesa-users at lists.mesastar.org
>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
> 
> Hey Francis,
> 
> Thank you very much for your answer :) It has been very useful.
> 
> My best regards,
> 
> Pedro