Dynamic Spectrum and Imaging

Get Dynamic Sepctrum with SunCASA

Within SunCASA, you are using IPython to interact with the system. This does not mean extensive python experience is necessary. Basic Python interactions are straightforward, e.g., assigning parameters, importing modules, running functions. The first module we introduce is dspec. This module allows you to generate a dynamic spectrum from an MS file, and visualize it. You can select a subset of data by specifying a time range, spectral windows/channels, antenna baseline. More information of the selection syntax may be found in the time range, spectral windows/channels, antenna baseline pages.

from suncasa.utils import dspec as ds

msfile = 'IDB20170821201020-203020.12s.slfcaled.ms'  # the visbility data
specfile = msfile + '.dspec.npz'  ## The output filename of the dynamic spectrum 
bl = ''    ##  antenna selection
spw = ''    ## Spectral Windows and Channels selection
timeran = ''    ## time range selection
domedian =True    ## select baselines with a median length (0.2~0.8km)
ds.get_dspec(vis=msfile, specfile=specfile, bl=bl, spw=spw, domedian=domedian)
ds.plt_dspec(specfile, pol='XXYY')