ppath_stepRefractionBasic

Workspace.ppath_stepRefractionBasic(self: pyarts.arts._Workspace, ppath_step: pyarts.arts.WorkspaceVariable | pyarts.arts.Ppath | None = self.ppath_step, refr_index_air_agenda: pyarts.arts.WorkspaceVariable | pyarts.arts.Agenda | None = self.refr_index_air_agenda, atmosphere_dim: pyarts.arts.WorkspaceVariable | pyarts.arts.Index | None = self.atmosphere_dim, p_grid: pyarts.arts.WorkspaceVariable | pyarts.arts.Vector | None = self.p_grid, lat_grid: pyarts.arts.WorkspaceVariable | pyarts.arts.Vector | None = self.lat_grid, lon_grid: pyarts.arts.WorkspaceVariable | pyarts.arts.Vector | None = self.lon_grid, z_field: pyarts.arts.WorkspaceVariable | pyarts.arts.Tensor3 | None = self.z_field, t_field: pyarts.arts.WorkspaceVariable | pyarts.arts.Tensor3 | None = self.t_field, vmr_field: pyarts.arts.WorkspaceVariable | pyarts.arts.Tensor4 | None = self.vmr_field, refellipsoid: pyarts.arts.WorkspaceVariable | pyarts.arts.Vector | None = self.refellipsoid, z_surface: pyarts.arts.WorkspaceVariable | pyarts.arts.Matrix | None = self.z_surface, f_grid: pyarts.arts.WorkspaceVariable | pyarts.arts.Vector | None = self.f_grid, ppath_lmax: pyarts.arts.WorkspaceVariable | pyarts.arts.Numeric | None = self.ppath_lmax, ppath_lraytrace: pyarts.arts.WorkspaceVariable | pyarts.arts.Numeric | None = self.ppath_lraytrace, verbosity: pyarts.arts.WorkspaceVariable | pyarts.arts.Verbosity | None = self.verbosity) → None

Calculates a propagation path step, considering refraction by a basic approach.

Refraction is taken into account by probably the simplest approach possible. The path is treated to consist of piece-wise geometric steps. A geometric path step is calculated from each point by using the local line-of-sight. Snell’s law for spherical symmetry is used for 1D to determine the zenith angle at the new point. For 2D and 3D, the zenith angle is calculated using the average gradient of the refractive index between the two points. For 3D, the azimuth angle is treated in the same way as the zenith one.

The maximum length of each ray tracing step is given by the WSV ppath_lraytrace. The length will never exceed the given maximum, but it can be smaller. The ray tracing steps are only used to determine the path. Points to describe the path are included as for ppath_stepGeometric(), this including the functionality of ppath_lmax.

Author(s): Patrick Eriksson

Parameters:

  • ppath_step (Ppath, optional) – A propagation path step. See ppath_step, defaults to self.ppath_step [INOUT]

  • refr_index_air_agenda (Agenda, optional) – Calculation of the refractive index of air. See refr_index_air_agenda, defaults to self.refr_index_air_agenda [IN]

  • atmosphere_dim (Index, optional) – The atmospheric dimensionality (1-3). See atmosphere_dim, defaults to self.atmosphere_dim [IN]

  • p_grid (Vector, optional) – The pressure grid. See p_grid, defaults to self.p_grid [IN]

  • lat_grid (Vector, optional) – The latitude grid. See lat_grid, defaults to self.lat_grid [IN]

  • lon_grid (Vector, optional) – The longitude grid. See lon_grid, defaults to self.lon_grid [IN]

  • z_field (Tensor3, optional) – The field of geometrical altitudes. See z_field, defaults to self.z_field [IN]

  • t_field (Tensor3, optional) – The field of atmospheric temperatures. See t_field, defaults to self.t_field [IN]

  • vmr_field (Tensor4, optional) – VMR field. See vmr_field, defaults to self.vmr_field [IN]

  • refellipsoid (Vector, optional) – Reference ellipsoid. See refellipsoid, defaults to self.refellipsoid [IN]

  • z_surface (Matrix, optional) – The surface altitude. See z_surface, defaults to self.z_surface [IN]

  • f_grid (Vector, optional) – The frequency grid for monochromatic pencil beam calculations. See f_grid, defaults to self.f_grid [IN]

  • ppath_lmax (Numeric, optional) – Maximum length between points describing propagation paths. See ppath_lmax, defaults to self.ppath_lmax [IN]

  • ppath_lraytrace (Numeric, optional) – Maximum length of ray tracing steps when determining propagation. See ppath_lraytrace, defaults to self.ppath_lraytrace [IN]

  • verbosity (Verbosity) – ARTS verbosity. See verbosity, defaults to self.verbosity [IN]