Changes between Version 11 and Version 12 of AstroBearProjects/multiphysics


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Timestamp:
10/28/19 13:58:00 (5 years ago)
Author:
Atma
Comment:

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  • AstroBearProjects/multiphysics

    v11 v12  
    168168[[Image(http://www.pas.rochester.edu/~shuleli/res_dia1.png, 25%)]][[BR]][[BR]]
    169169
    170 In cgs units, the real magnetic diffusivity can be written as:[[BR]]
    171 
    172 [[latex($\eta = c^2/4\pi \sigma$)]]
    173 
    174 where [[latex($\sigma$)]] is the material conductivity which depends on the electron-ion collision rate [[latex($\nu_{ei}$)]] which in term depends on the electron temperature [[latex($T^{-3/2}$)]]. [[BR]]
     170In cgs units, the real '''magnetic diffusivity''' can be written as:[[BR]]
     171
     172[[latex(${\displaystyle \eta = \frac{c^2}{4\pi \sigma} }$)]]
     173
     174where, [[latex($\sigma$)]] is the material conductivity which depends on the electron-ion collision rate [[latex($\nu_{ei}$)]] which in term depends on the electron temperature [[latex($T^{-3/2}$)]]. Note that magnetic diffusivity [[latex($ (\eta)$)]] is used interchangeably with resistivity [[latex($ (1 / \sigma)$)]] in some places of this wiki, but they are not the same. [[BR]]
    175175The cross field diffusivity can thus be expressed as function of electron temperature if we assume the plasma is fully ionized:[[BR]]
    176176