single_radClearskyEmissionPropagation

Workspace.single_radClearskyEmissionPropagation(self, single_rad: Stokvec = self.single_rad, single_rad_jac: StokvecVector = self.single_rad_jac, ray_path: ArrayOfPropagationPathPoint = self.ray_path, atm_field: AtmField = self.atm_field, freq: Numeric = self.freq, jac_targets: JacobianTargets = self.jac_targets, single_rad_space_agenda: Agenda = self.single_rad_space_agenda, single_rad_surface_agenda: Agenda = self.single_rad_surface_agenda, single_propmat_agenda: Agenda = self.single_propmat_agenda, ray_point_back_propagation_agenda: Agenda = self.ray_point_back_propagation_agenda, subsurf_field: SubsurfaceField = self.subsurf_field, surf_field: SurfaceField = self.surf_field, obs_pos: Vector3 = self.obs_pos, obs_los: Vector2 = self.obs_los, max_stepsize: Numeric = self.max_stepsize, polarization: Propmat = [0, 0, 0, 0, 0, 0, 0], max_tau: Numeric = 0.01, cutoff_tau: Numeric = 14, hse_derivative: Index = 0, N: Index = 1) → None

Computes the spectral radiance for a single frequency using clear-sky emission propagation.

The path is built based on current optical properties and the radiative transfer equation is solved along the path. This means that the path is not precomputed but built on-the-fly, allowing per-frequency refraction.

Author: Richard Larsson

Parameters:

  • single_rad (~pyarts3.arts.Stokvec, optional) – Single value version of spectral_rad. Defaults to self.single_rad. [OUT]

  • single_rad_jac (~pyarts3.arts.StokvecVector, optional) – Single value version of spectral_rad_jac. Defaults to self.single_rad_jac. [OUT]

  • ray_path (~pyarts3.arts.ArrayOfPropagationPathPoint, optional) – A list path points making up a propagation path. Defaults to self.ray_path. [OUT]

  • atm_field (~pyarts3.arts.AtmField, optional) – An atmospheric field in ARTS, this is the main atmospheric data structure in ARTS. Defaults to self.atm_field. [IN]

  • freq (~pyarts3.arts.Numeric, optional) – A single frequency. Unit: Hz. Defaults to self.freq. [IN]

  • jac_targets (~pyarts3.arts.JacobianTargets, optional) – A list of targets for the Jacobian Matrix calculations. Defaults to self.jac_targets. [IN]

  • single_rad_space_agenda (~pyarts3.arts.Agenda, optional) – Gets spectral radiance as seen of space for a single frequency. Defaults to self.single_rad_space_agenda. [IN]

  • single_rad_surface_agenda (~pyarts3.arts.Agenda, optional) – Gets spectral radiance as seen of the surface for a single frequency. Defaults to self.single_rad_surface_agenda. [IN]

  • single_propmat_agenda (~pyarts3.arts.Agenda, optional) – Computes the propagation matrix, the non-LTE source vector, the dispersion, and their derivatives. Defaults to self.single_propmat_agenda. [IN]

  • ray_point_back_propagation_agenda (~pyarts3.arts.Agenda, optional) – Gets the next past point along a propagation path. Defaults to self.ray_point_back_propagation_agenda. [IN]

  • subsurf_field (~pyarts3.arts.SubsurfaceField, optional) – The sub-surface field. Defaults to self.subsurf_field. [IN]

  • surf_field (~pyarts3.arts.SurfaceField, optional) – The surface field. Defaults to self.surf_field. [IN]

  • obs_pos (~pyarts3.arts.Vector3, optional) – The position of an observer of spectral radiance. Defaults to self.obs_pos. [IN]

  • obs_los (~pyarts3.arts.Vector2, optional) – The line-of-sight of the observer of spectral radiance. Defaults to self.obs_los. [IN]

  • max_stepsize (~pyarts3.arts.Numeric, optional) – A control parameter for stepping through layers in ray tracing. Defaults to self.max_stepsize. [IN]

  • polarization (~pyarts3.arts.Propmat, optional) – Delta of the dispersion in polarizized form. The dot-product of this and the propagation matrix is added to the internal single_dispersion variable. Defaults to 0 0 0 0 0 0 0 [IN]

  • max_tau (~pyarts3.arts.Numeric, optional) – The maximum optical thickness per step, min of local Propmat A divided by max_tau and max_stepsize is passed to ray_point_back_propagation_agendaExecute(). Note that this is an approximation that will fail for highly non-linear absorption profiles. As implemented, it takes too long steps if going from low to high absorption, and too short steps when going from high to low absorption. See it as an approximation. Defaults to 0.01 [IN]

  • cutoff_tau (~pyarts3.arts.Numeric, optional) – Cutoff optical thickness for terminating the integration, computed as total Propmat A times distance. If exceeded, the atmosphere is considered opaque and the temperature at that coordinate is used for the background radiation. If not exceeded, the actual background is considered. Note that errors will be large if exp(-cutoff_tau) is not small. Defaults to 14 [IN]

  • hse_derivative (~pyarts3.arts.Index, optional) – Flag to compute the hypsometric distance derivatives. Defaults to 0 [IN]

  • N (~pyarts3.arts.Index, optional) – Number of points to reserve in the ray path. Defaults to 1 [IN]