ChiantiPy.model package

Submodules

ChiantiPy.model.Maker module

classes and methods to analyze observations of astrophysical spectra

ChiantiPy.model.Maker.doDemGofntQ(inQueue, outQueue)

helper for multiprocessing with maker.mgofnt()

ChiantiPy.model.Maker.emPlot(matchDict, vs='T', loc='upper right', fs=10, adjust=None, position='both', legend=True, verbose=0)

to plot line intensities divided by gofnt adjust is to provide an adjustment to the position of the labels position : one of ‘both’, ‘right’, ‘left’, or ‘none’

Keyword Arguments

• vs (str, either ‘T’, or ‘D’) – whether to plot the emission measure vs temperature or density

• loc (str) – matplotlib argument for plt.legend

• fs (int) – the fontsize for the legend

• adjust (list) – a list of multiplicative adjustments to the labels to the plot lines must be the same length as the number of lines

• position (str) – where the labels to the lines should be placed, both for both ends, left for the left size only, ‘right’ for the right side only, or None for no labels

• label (bool) – whether to apply

• legend (bool) – whether to include a matplotlib legend

• fontsize (int) – fontsize for the matplotlib xlabel and ylabel

• tscale (float) – scale the temperature by dividing by tscale

• verbose (bool) – if True, additional output is sent to the terminal

class ChiantiPy.model.Maker.maker(specData, temperature=None, eDensity=None, elementList=[], ionList=[], allLines=False, abundanceName=None, minAbund=10.0, wghtFactor=None, verbose=False)

Bases: ChiantiPy.base._IonTrails.ionTrails, ChiantiPy.base._SpecTrails.specTrails

a class matching observed lines to lines in the CHIANTI database

Parameters

specData (dict) – contains the following keys intensity - a list of observed line intensities wvlObs - a list of observed wavelengths, usually in Angstroms dwvl the expected wavelength different between the observed wvl and CHIANTI

Keyword Arguments

• temperature (float, list, ndarray) – the temperature(s) in K

• eDensity (float, ndarray) – eDensity: electron density in \(\mathrm{cm^{-3}}\)

• elementList (list) – a list of elements, such as fe, to be searched

• ionList (list) – a list of ions, such as fe_14, to be searched

• allLines (bool) – if true, unobserved lines in CHIANTI are included in the search

• abundanceName (str) – the name of the elemental abundance file to be used, if not set, the default abundance file is used

• minAbund (float) – sets the minimum abundance for an element to be included in the search

• verbose (bool) – if True, additional output is sent to the terminal

argCheck(temperature=None, eDensity=None, pDensity='default', verbose=False)

to check the compatibility of the three arguments and put them into numpy arrays of atleast_1d

Keyword Arguments

• temperature (float, list, ndarray) – the temperature(s) in K

• eDensity (float, ndarray) – eDensity: electron density in \(\mathrm{cm^{-3}}\)

• pDensity (str, float, ndarray) – pDensity: proton density in \(\mathrm{cm^{-3}}\) defaults to ‘default’

• verbose (bool) – if True, additional output is sent to the terminal

diff(sort=None, verbose=False)

calculates the weighted and straight differences between observed and predicted creates an attribute self.Dict, a dict with the following keys: ‘wvl’ = observed wavelength (A) ‘relDiff’ = (I_obs - I_pred)/(I_obs) ‘ionS’ the CHIANTI type name for an ion sort be either of none, ‘wvl’, or ‘ion’

Keyword Arguments

sort (str or None) – whether the output should be sorted by wvl or ion or not

diffPlot(ratio='diffOverInt', title=False, loc='upper right', fontsize=16, figsize=[7.0, 5.0])

Parameters

• ratio (str) – determines which Y values to print can be ‘diffOverInt’ (default), or ‘intOverPred’, or ‘predOverInt’

• title (bool) – whether to plot the title or not

• fontsize (int) – fontsize for matplotlib plots

• figsize (2d list, ndarray) – the figure size for the plot

Variables

DiffPlot (dict) – contains the fig, ax matplotlib objects created

diffPrint(filename='diffPrint.txt', sort=None)

calculates the weighted and straight differences between observed and predicted prints the values and saves to a file also created a attribute self.Dict, a dict with the following keys: ‘wvl’ = observed wavelength (A) ‘relDiff’ = (I_obs - I_pred)/(I_obs) ‘ionS’ the CHIANTI type name for an ion

Keyword Arguments

• filename (str) – the filename where the text should be output

• sort (str, can be wvl, ion, or None) – whether the output should be sorted by wvl or ion or not

emFitPlot()

to plot the emission measures derived from a chi-squared search over temperature

emPlot(vs='T', loc='upper right', fs=10, adjust=None, position='both', label=True, legend=True, fontsize=16, tscale=1.0, verbose=True)

to plot line intensities divided by gofnt adjust is to provide an adjustment to the position of the labels position : one of ‘both’, ‘right’, ‘left’, or ‘none’

Keyword Arguments

• vs (str, either ‘T’, or ‘D’) – whether to plot the emission measure vs temperature or density

• loc (str) – matplotlib argument for plt.legend

• fs (int) – the fontsize for the legend

• adjust (list) – a list of multiplicative adjustments to the labels to the plot lines must be the same length as the number of lines

• position (str) – where the labels to the lines should be placed, both for both ends, left for the left size only, ‘right’ for the right side only, or None for no labels

• label (bool) – whether to apply

• legend (bool) – whether to include a matplotlib legend

• fontsize (int) – fontsize for the matplotlib xlabel and ylabel

• tscale (float) – scale the temperature by dividing by tscale

• verbose (bool) – if True, additional output is sent to the terminal

emPlotObj(vs='T', loc='upper right', fs=10, adjust=None, position='both', label=True, legend=True, fontsize=16, figsize=[7.0, 5.0], tscale=1.0, verbose=True)

the emPlot using the object oriented version of matplotlib - a figure and axis objects are returned to plot line intensities divided by gofnt adjust is to provide an adjustment to the position of the labels position : one of ‘both’, ‘right’, ‘left’, or ‘none’ this uses the modern object interface fig, ax = plt.subplots(figsize=figsize) fig, ax are in returned in the self.EmPlotOjb dict

Keyword Arguments

• vs (str, either ‘T’, or ‘D’) – whether to plot the emission measure vs temperature or density

• loc (str) – matplotlib argument for plt.legend

• fs (int) – the fontsize for the legend

• adjust (list) – a list of multiplicative adjustments to the labels to the plot lines must be the same length as the number of lines

• position (str) – where the labels to the lines should be placed, both for both ends, left for the left size only, ‘right’ for the right side only, or None for no labels

• label (bool) – whether to apply

• legend (bool) – whether to include a matplotlib legend

• fontsize (int) – fontsize for the matplotlib xlabel and ylabel

• figsize (two element list or ndarray) – sets the figure size when using matplotlib subplots to initiate the object style plotting

• tscale (float) – scale the temperature by dividing by tscale

• verbose (bool) – if True, additional output is sent to the terminal

emSet(value)

sets the EM values for a N temperature EM distribution

Parameters

value (list, ndarray) – the values of the emission measure to be used when the intensities are predicted

emSetIndices(indices, add=0.0, verbose=0)

to set the indices of the N temperature/density EM distribution can increase the number of paramaters if additional parameters have been used

Parameters

indices (list, ndarray) – the indices of the temperature/density arrays for which a set of intensities will be predicted

Keyword Arguments

• add (float) – to increase the number of parameters used in the calculation of the reduced chi-squared

• verbose (bool) – if True, additional output is sent to the terminal

emWrite(filename, directory, reference)

to make a CHIANTI style emission measure file outName does not need the suffix .em reference should be a list of references

Parameters

• filename (str) – the name of the em file to be produced

• reference (list) – a list of strings providing a reference at the end of the em file

findMinMaxIndices(verbose=0)

to find the minimum and maximum indices where all match[‘intensitySum’] are greater than 0

Keyword Arguments

verbose (bool) – if True, additional output is sent to the terminal

fit1t(initialValue, maxfev=0)

calls leastsq to fit the 1t (single temperature) model used in search1dspace

Parameters

initialValue (float) – the initial value to start the leastsq process

Todo

see if this can be replaced by fitFunct1t or fitNt

fitFunc1t(em)

the fitting function for the isothermal model to be called by leastsq called by fit1t

Parameters

em (number) – the log10 value of the emission measure

Returns

weighted chisquared

Return type

float

Todo

see if this can be replaced by fitFuncNt

fitFuncNt(value)

the fitting function for the multiple temperature model to be called by leastsq called by fitNt

Parameters

value (list) – the initial values for the em fit

fitNt(initialValue, maxfev=0)

calls leastsq to fit the multi temperature models called by search2tSpace, search3tSpace etc

Parameters

initialValue (list) – the initial trial value for the emission measure (log1))

Keyword Arguments

maxfev (int) – not sure it is needed

getChisq()

return the weighted chi-squared

getNormalizedChisq()

return normalized chisq: chi-squared divided by the number of observed lines

getWeightedDiff()

to calculated the weighted difference of each of the intensities returns a 1D array

gofnt(temperature, density, verbose=1)

calculate the gofnt function for each of the matched lines do each ion only once

Parameters

• temperature (float, list, ndarray) – the temperature(s) in K

• density (float, list, ndarray) – density: electron density in \(\mathrm{cm^{-3}}\)

loadMatch(filename)

to open a pickle file, return the match data and make it an attribute

loadSearchData(filename)

to load the pickled search data as an attribute self.SearchData

Keyword Arguments

filename (str) – the filename of the pickle file where the search data has been created

makeMatch(verbose=False)

to match the CHIANTI lines with the input specdata uses ionTrails.ionGate to sort through ions

Keyword Arguments

verbose (bool) – if True, additional output is sent to the terminal

matchPrint(filename='matchPrint.txt', sort=None, verbose=False)

to print out the data for the matches to the observed lines sort can be ‘wvl’ or ‘ion’, otherwise, there is no sorting done does not require predicted values

Keyword Arguments

• filename (str) – the filename where the text should be output

• sort (str, can be wvl, ion, or None) – whether the output should be sorted by wvl or ion or not

• verbose (bool) – if True, additional output is sent to the terminal

mgofnt(temperature, density, proc=6, timeout=0.1, verbose=False)

calculate the gofnt function for each of the matched lines this is the multiprocessing version does each ion only once

Parameters

• temperature (float, list, ndarray) – the temperature(s) in K

• density (float, list, ndarray) – density: electron density in \(\mathrm{cm^{-3}}\)

Keyword Arguments

• proc (int) – the number of cores to be used

• timeout ('float') – may not actually be necessary

• verbose (bool) – if True, additional output is sent to the terminal

predict()

to predict the intensities of the observed lines from an emission measure the emission measure is already specified as self.Em which is an ndarray the temperatures are set by emSetIndices

predictPrint(minContribution=0.1, filename='predictPrint.txt', sort=None, verbose=0)

to predict the intensities of the observed lines from an emission measure the emission measure is already specified as self.Em which is an np array sort can be ‘wvl’ or ‘ion’, otherwise, there is no sorting done

Keyword Arguments

• minContribution (float) – the minimum contribution a blend must supply to be included in the text output

• filename (str) – the filename where the text should be output

• sort (str, can be wvl, ion, or None) – whether the output should be sorted by wvl or ion or not

• verbose (bool) – if True, additional output is sent to the terminal

predictPrint1d(minContribution=0.1, filename='predictPrint1d.txt', verbose=False)

to predict the intensities of the observed lines from an emission measure the emission measure is already specified as self.Em which is an np array

to be used after a 1d search over density

Keyword Arguments

• minContribution (float) – the minimum contribution a blend must supply to be included in the text output

• filename (str) – the filename where the text should be output

• verbose (bool) – if True, additional output is sent to the terminal

saveMatch(filename)

to save the attribute Match to a pickle file so that it can be reloaded later

Keyword Arguments

filename (str) – the filename where the text should be output

saveSearchData(filename)

to save the attribute SearchData to a pickle file

Keyword Arguments

filename (str) – the filename of the pickle file where the search data is to be created

search1dSpace(initialEm, indxlimits=None, verbose=False, log=False, maxfev=0)

to conduct a brute force search over electron density for an isothermal-space and find the best fit to the em and density indxlimits give the range of indices to fit over can use self.MinIndex and self.MaxIndex+1 initialEm = log value of the emission measure to begin the searching

Parameters

initialEm (float) – the initial trial value for the log10 emission measure

Keyword Arguments

• indxlimits (list, None) – the range of indices of the density array to search if None is specified, the whole range is searched

• verbose (bool) – if True, additional output is sent to the terminal

• log (bool) – if True, a log file is created - ‘search1d.raw’

search1tEmSpace(verbose=False)

to find the value of chisq as a function of Em with T = best-fit

Keyword Arguments

verbose (bool) – if True, additional output is sent to the terminal

search2tSpace(initial, indxlimits=None, verbose=0, log=0, maxfev=0)

to conduct a brute force search of 2 temperature space and find the best fit indxlimits give the range of indices to fit over

Parameters

initial (list) – the initial trial values (2) for the log10 emission measure

Keyword Arguments

• indxlimits (list, None) – the range of indices of the density array to search if None is specified, the whole range is searched

• verbose (bool) – if True, additional output is sent to the terminal

• log (bool) – if True, a log file is created - ‘search1d.raw’

search3tSpace(initial, indxlimits=None, verbose=0, log=0)

to conduct a brute force search of 3 temperature space and find the best fit

Parameters

initial (list) – the initial trial values (3) for the log10 emission measure

Keyword Arguments

• indxlimits (list, None) – the range of indices of the density array to search if None is specified, the whole range is searched

• verbose (bool) – if True, additional output is sent to the terminal

• log (bool) – if True, a log file is created - ‘search1d.raw’

search4tSpace(initial, indxlimits=None, verbose=0, log=0)

to conduct a brute force search of 4 temperature space and find the best fit set log to create a log file of the iterations rather that outputting to the jupyter/ipython session

Parameters

initial (list) – the initial trial values (4) for the log10 emission measure

Keyword Arguments

• indxlimits (list, None) – the range of indices of the density array to search if None is specified, the whole range is searched

• verbose (bool) – if True, additional output is sent to the terminal

• log (bool) – if True, a log file is created - ‘search1d.raw’

Module contents