milne
Milne-Eddington synthesis
This is a module for the synthesis of spectral lines in the Milne-Eddington approximation.
Compilation
The code is written in Fortran 90 and has to be compiled with the gfortran free compiler.
Install it in your system and type the following in the source directory:
python setup.py build_ext --inplace
Usage
from milne import milne
# Define the details of the spectral line
lambda0 = 6301.5080
JUp = 2.0
JLow = 2.0
gUp = 1.5
gLow = 1.833
lambdaStart = 6300.8
lambdaStep = 0.03
nLambda = 50
lineInfo = np.asarray([lambda0, JUp, JLow, gUp, gLow, lambdaStart, lambdaStep])
# Define the model
BField = 100.0
BTheta = 20.0
BChi = 20.0
VMac = 2.0
damping = 0.0
B0 = 0.8
B1 = 0.2
mu = 1.0
VDop = 0.085
kl = 5.0
modelSingle = np.asarray([BField, BTheta, BChi, VMac, damping, B0, B1, VDop, kl])
# Generate the object and do one synthesis. The wavelength axis is a property of the object
s = milne(nLambda, lineInfo)
stokes = s.synth(modelSingle,mu)
# It can also synthesize many models at the same time
model = np.tile(modelSingle, (nModels,1)).T
stokes = s.synthGroup(model,mu)
# It can also return the response functions
stokes, dStokes = s.synthDerivatives(modelSingle,mu)
# Or for many models
stokes, dStokes = s.synthGroupDerivatives(model,mu)