Changes between Version 11 and Version 12 of u/erica/radtimescales
- Timestamp:
- 03/30/16 13:30:02 (9 years ago)
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u/erica/radtimescales
v11 v12 1 1 '''Diffusion time estimate''' 2 3 This is an estimate for how long it should take radiation to diffuse through gas. The longer this timescale, the more confined the radiation is -- and thus, the more it can act as a source of heating. 2 4 3 5 Starting from: … … 52 54 or 57 days. 53 55 56 ''' Coupling time estimate ''' 57 58 This timescale provides an estimate for how long it should take the to 'heat up' (or cool down) from radiation (right?). This is controlled by the planck opacity, [[latex($\kappa_P$)]]. For low [[latex($\kappa_P$)]], the matter and radiation are relatively decoupled. Adjusting the degree of coupling is akin to adjusting the specific heat capacity of the material (right?). 59 60 Starting from, 61 62 [[latex($\frac{dE}{dt} = {\kappa_P\rho}(4\pi B - cE)$)]] 63 64 we have: 65 66 67 68 69 70