Dear Stefan,
If you have a controlfile to compute the od and tangent altitude it should be fairly easy to wrap this into a python function and use scipy.optimize.root to find the zero of od - 1.0. Cheers, Simon ________________________________ From: arts_dev.mi-boun...@mailman.rrz.uni-hamburg.de <arts_dev.mi-boun...@mailman.rrz.uni-hamburg.de> on behalf of Stefan Buehler <stefan.bueh...@uni-hamburg.de> Sent: Friday, March 9, 2018 3:17:42 PM To: ARTS Development List Subject: [arts-dev] Transit radius Dear all, here is an ARTS challenge, not strictly important right now, but for my own curiosity. Probably mostly to Patrick, but perhaps interesting also for others. For exoplanet research, one observation technique provides the planet's transit radius, that is, the tangent radius where the optical depth of the limb path is one. Can we generate this with ARTS? The simple-minded way I can come up with is to do a limb simulation and store opacity for each pencil-beam, along with its tangent altitude. Then interpolate to find the tangent altitude for which the opacity along the limb path is one. Is there a smarter way? And, for the way I outlined, what is the currently recommended way to get out tangent altitude and opacity along the los? If it is easy to generate, I feel tempted to include a “transit radius” view to the nadir spectrum figure in the paper. Best wishes, Stefan
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