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Supported variables and data reducers
Analysator supports reading multiple different types of variables:
- MPIgrid variables
- FSgrid variables
- variables directly available in the data files
- variables generated via receipes from the data file variables (named, somewhat incorrectly, datareducers)
In Vlasiator versions before V5, variables were always saved on the DCCRG/MPI/Vlasov grid, and as such, only a single naming scheme was required. With the introduction of Vlasiator V5, variables could also be saved on the FSgrid. When the new ionosphere will be implemented, that can also be saved to on its own grid. To differentiate between the different grids, a naming scheme was introduced where a prefix defines the grid type:
- No prefix: old pre-V5 data
- prefix
vg_: Vlasov/MPI/DCCRG grid - prefix
fg_: fieldsolver/FSgrid - prefix
ig_: ionosphere grid
Some variables are directly connected to a given particle species, with the variable name having a particle species prefix. For example: ´proton/rho´ or proton/vg_rho for V4 and V5 outputs respectively. Note that multipop outputs are always on the Vlasov grid, but still have the vg_ prefix after the particle species name. Some variable such as rho and blocks which are directly connected to particle species are availabe without the population identifier in datafiles from version 3 and earlier.
The below tables list variable names used in different versions of Vlasiator proper. A blank entry in a corresponding column indicates this variable is not available. Some debugging variables such as field derivatives have been omitted from the table.
| FSgrid variables | Corresponding Vlasov grid variable in older versions |
|---|---|
| fg_b | B |
| fg_b_background | background_B |
| fg_b_perturbed | perturbed_B |
| fg_b_vol | B_vol |
| fg_e | E |
| fg_e_hall_?? | EXHALL_???_??? |
| fg_e_vol | E_vol |
| fg_rhom | Rhom |
| fg_rhoq | Rhoq |
| fg_v | V |
| fg_pressure | Pressure |
| fg_maxdt_fieldsolver | max_fields_dt |
| fg_rank | FSgrid_rank |
| fg_amr_level | |
| fg_boundarytype | FSgrid_boundaryType |
| fg_boundarylayer | Boundary_layer |
| V5 Vlasov grid variables | Older Vlasov grid variables |
|---|---|
| vg_rhom | Rhom |
| vg_rhoq | Rhoq |
| vg_v | V |
| vg_pressure | Pressure |
| Blocks | |
| vg_b_vol | B_vol |
| vg_b_background_vol | BGB_vol |
| vg_b_perturbed_vol | PERB_vol |
| E | |
| vg_e_vol | E_vol |
| vg_e_gradpe | EGRADPE |
| vg_f_saved | fSaved |
| vg_maxdt_acceleration | max_v_dt |
| vg_maxdt_translation | max_r_dt |
| vg_rank | MPI_rank |
| vg_loadbalance_weight | LB_weight |
| vg_boundarytype | Boundary_type |
| vg_boundarylayer | Boundary_layer |
| Per-population variables | Older per-population variables |
|---|---|
| populations/vg_rho | populations/rho |
| populations/vg_v | populations/V |
| populations/vg_rho_thermal | populations/RhoNonBackstream |
| populations/vg_rho_nonthermal | populations/RhoBackstream |
| populations/vg_v_thermal | populations/VNonBackstream |
| populations/vg_v_nonthermal | populations/VBackstream |
| populations/vg_effectivesparsitythreshold | populations/EffectiveSparsityThreshold |
| populations/vg_rho_loss_adjust | populations/rho_loss_adjust |
| populations/vg_energydensity | populations/EnergyDensity |
| populations/vg_precipitationdifferentialflux | populations/PrecipitationDiffFlux |
| populations/vg_maxdt_acceleration | populations/MaxVdt |
| populations/vg_maxdt_translation | populations/MaxRdt |
| populations/vg_blocks | populations/Blocks |
| populations/vg_acceleration_subcycles | populations/acc_subcycles |
| populations/vg_ptensor_diagonal | populations/PTensorDiagonal |
| populations/vg_ptensor_offdiagonal | populations/PTensorOffDiagonal |
| populations/vg_ptensor_nonthermal_diagonal | populations/PTensorBackstreamDiagonal |
| populations/vg_ptensor_nonthermal_offdiagonal | populations/PTensorBackstreamOffDiagonal |
| populations/vg_ptensor_thermal_diagonal | populations/PTensorNonBackstreamDiagonal |
| populations/vg_ptensor_thermal_offdiagonal | populations/PTensorNonBackstreamOffDiagonal |
UNDER CONSTRUCTION