Skip to main content


Showing posts from March, 2013

Atmospheric transmission curve for Plateau de Bure Interferometer

I tried to find the atmospheric transmission curve for Plateau de Bure Interferometer (PdBI) site the other day. There is no plot/data file showing the atmospheric transmission for the Plateaude Bure Interferometer site! Then I realized that I might be able to plot it in the GILDAS software ASTRO - the observation planning tasks of the bundle. So in this post I will explain how to plot the atmospheric transmission curve at the Plateau de Bure Interferometer (PdBI) using the atmospheric modeling function included in the ASTRO package included in the IRAM GILDAS software bundle, and Python. I guess you can do the same plot in ASTRO using GREG, but I like Python/matplotlib more.
After checking and sending mails back and forth with Jan Martin Winters at IRAM, I realized that there is not direct command to plot the whole transmission curve. What does exist is the command ATMOSPHERE, that calculates τ (the opacity) and a whole bunch of other stuff for a given frequency (running "HELP AT…