# mspectrum¶

class ChiantiPy.core.mspectrum(temperature, eDensity, wavelength, filter=(<function gaussianR>, 1000.0), label=0, elementList=None, ionList=None, minAbund=None, keepIons=0, abundance=None, doLines=1, doContinuum=1, allLines=1, em=None, proc=3, verbose=0, timeout=0.1)[source] [edit on github]

this is the multiprocessing version of spectrum set proc to the desired number of processors, default=3

Calculate the emission spectrum as a function of temperature and density.

temperature and density can be arrays but, unless the size of either is one (1), the two must have the same size

the returned spectrum will be convolved with a filter of the specified width on the specified wavelength array

the default filter is gaussianR with a resolving power of 100. Other filters, such as gaussian, box and lorentz, are available in chianti.filters. When using the box filter, the width should equal the wavelength interval to keep the units of the continuum and line spectrum the same.

A selection of elements can be make with elementList a list containing the names of elements that are desired to be included, e.g., [‘fe’,’ni’]

A selection of ions can be make with ionList containing the names of the desired lines in Chianti notation, i.e. C VI = c_6

Both elementList and ionList can not be specified at the same time

a minimum abundance can be specified so that the calculation can be speeded up by excluding elements with a low abundance. With solar photospheric abundances -

setting minAbund = 1.e-4 will include H, He, C, O, Ne setting minAbund = 2.e-5 adds N, Mg, Si, S, Fe setting minAbund = 1.e-6 adds Na, Al, Ar, Ca, Ni

Setting em will multiply the spectrum at each temperature by the value of em.

em [for emission measure], can be a float or an array of the same length as the temperature/density. allLines = 1 will include lines with either theoretical or observed wavelengths. allLines=0 will include only those lines with observed wavelengths

proc = the number of processors to use timeout - a small but non-zero value seems to be necessary