ARTS built-in documentation server

Workspace Method iyTransmissionStandard

Description

Standard method for handling (direct) transmission measurements.

Designed to be part of iy_main_agenda. Treatment of the cloudbox
is incorporated (that is, no need to define iy_cloudbox_agenda).

In short, the propagation path is followed until the surface or
space is reached. At this point iy_transmitter_agenda is called
and the radiative transfer calculations start. That is, the result
of the method (iy) is the output of iy_transmitter_agenda
multiplied with th transmission from the sensor to either the
surface or space.

The following auxiliary data can be obtained:
  "Pressure": The pressure along the propagation path.
     Size: [1,1,1,np].
  "Temperature": The temperature along the propagation path.
     Size: [1,1,1,np].
  "VMR, species X": VMR of the species with index X (zero based).
     For example, adding the string "VMR, species 0" extracts the
     VMR of the first species. Size: [1,1,1,np].
  "Absorption, summed": The total absorption matrix along the
     path. Size: [nf,ns,ns,np].
  "Absorption, species X": The absorption matrix along the path
     for an individual species (X works as for VMR).
     Size: [nf,ns,ns,np].
  "Particle extinction, summed": The total particle extinction
       matrix along the path. Size: [nf,ns,ns,np].
  "PND, type X": The particle number density for particle type X
       (ie. corresponds to book X in pnd_field). Size: [1,1,1,np].
  "Mass content, X": The particle content for mass category X.
       This corresponds to column X in particle_masses (zero-
       based indexing). Size: [1,1,1,np].
* "Radiative background": Index value flagging the radiative
     background. The following coding is used: 0=space, 1=surface
     and 2=cloudbox. Size: [nf,1,1,1].
  "iy": The radiance at each point along the path.
     Size: [nf,ns,1,np].
  "Transmission": The transmission matrix from the surface or
     space, to each propagation path point. The matrix is valid for
     the photon direction. Size: [nf,ns,ns,np].
* "Optical depth": The scalar optical depth between the
     observation point and the end of the primary propagation path
     (ie. the optical depth to the surface or space.). Calculated
     in a pure scalar manner, and not dependent on direction.
     Size: [nf,1,1,1].
* "Faraday rotation": Total rotation [deg] along the path, for
     each frequency. Size: [nf,1,1,1].
* "Faraday speed": The rotation per length unit [deg/m], at each
     path point and each frequency. Size: [nf,1,1,np].
where
  nf: Number of frequencies.
  ns: Number of Stokes elements.
  np: Number of propagation path points.

The auxiliary data are returned in iy_aux with quantities
selected by iy_aux_vars. Most variables require that the method
is called directly or by iyCalc. For calculations using yCalc,
the selection is restricted to the variables marked with *.

Authors: Patrick Eriksson

Synopsis

Variables