CMR Header

CCMC Metadata Registry (CMR)

Menu Page

Go to:

 CMR: View Simulation Run Info

SWMF/2011/TEMPLATE

Run Description 

SWMF v 2011 run template

Simulation Time:

Simulation Start Time:
Simulation End Time:
Time Step in second:
Simulation Time Description:
Simulation Time Caveats:

Temporal Dependence (whether the outputs of the simulation code are time-dependent?): true

Regions:

Earth.Magnetosphere
Earth.Magnetosphere.Magnetotail
Earth.Magnetosphere.Main
Earth.Magnetosphere.RadiationBelt
Earth.NearSurface.AuroralRegion
Earth.NearSurface.PolarCap

Simulation Domain :

Coordinate System:
    Coordinate Representation:Cartesian CoordinateSystemName: GSM
Simulation Domain Description: Rectangular box containing magnetosphere.
Simulation Domain Caveats: Near-Earth boundary above ionosphere and current layer.
Spatial Dimension: 3
Velocity Dimension: 1
Field Dimension: 1
Units: R_E
Coordinates Label: X, Y, Z
Valid Min: -1000
Valid Max: 1000
Grid Structure: Block-adaptive octree.
Grid Cell Size: 0.0
Symmetry: None
Boundary Condition:
    Boundary Type: FieldBoundary
    Front Wall: inflow
    Back Wall: outflow
    Side Wall: outflow
    Obstacle: no flow

Contacts :

List of Run Input Parameter Grouping and their associated properties :

Name Description Caveats Properties
Solar wind inputs 
Time-dependent solar wind plasma and magnetic field inputs.
 Solar wind inputs are derived from a single spacecraft usually 200 R_E upstream of the sun-ward (front) simulation box boundary.
Name Label Description Caveats Units Default Value or Actual Value Valid Min Valid Max
N N 
Solar wind plasma density.
 Mass density described in terms of number of protons per cubic centimeter. AMU/cm^3 5 0.1 100
T T 
Solar wind plasma temperature.
 Derived from observed distribution of solar wind particles. Can fluctuate widely when density N is at or below 1 AMU/cm^3. K 200000 10000 2000000
Vx Vx 
Sun-Earth component of solar wind velocity.
 Low solar wind speed (less than 200 km/s in magnitude) usually indicates poor statistics in the solar wind plasma measurements. km/s -400 -3000 -200
Vy Vy 
Plasma velocity in dawn-dusk direction.
 The orbital velocity of Earth (about 29 km/s) is usually neglected. km/s 0 -500 500
Vz Vz 
Solar wind plasma velocity in north-south direction.
 km/s 0 -500 500
Bx Bx 
Sun-Earth component of solar wind magnetic field.
 Bx is usually held constant (zero or average of observed values) to conserve div.B at the front boundary. Alternatively, oblique phase fronts can be assumed that update solar wind conditions along those fronts throughout the front boundary. Bx is then approximated as a linear combination of time dependent By and Bz. nT 0 -100 100
By By 
Dawn-dusk component of solar wind magnetic field.
 nT 0 -100 100
Bz Bz 
North-south component of the solar wind magnetic field. 
B_z is most important magnetic field component to drive or inhibit geomagnetic activity.
Other components play a role in connection with the orientation of the Earth's dipole field.
 nT -5 -100 100
sw_source sw_source 
Name of the spacecraft or data source used to generate solar wind input information.
Currently one of ACE-RT ACE-L2, WIND, OMNI, DSCOVR (real time)
 User-submitted data may be from any source or made-up. OMNI
solarwind solarwind 
Flag indicating whether solar wind data are constant (initial values) or variable (var).
 const var
constant-Bx constant-Bx 
Constant Bx value fed into the front boundary of the simulation.
 nT 0
By-coefficient By-coefficient 
Coefficient for By in linear combination approximating Bx: 
Bx ~ constant-Bx + By-coefficient*By + Bz-coefficient*Bz
 -1 1
Bz-coefficient Bz-coefficient 
Coefficient for Bz in linear combination approximating Bx: Bx ~ constant-Bx + By-coefficient*By + Bz-coefficient*Bz
 0 -1 1
SW density floor SW density floor 
Lowest value of N applied during pre-processing of solar wind input data.
 The density floor in the solar wind varies by magnetosphere model and it's numerical stability. A similar floor may be imposed inside the magnetotail lobes where the density may drop lower than in the solar wind. AMU/cm^3 0.1 0.1 2.5
Ionosphere conductance model 

						
						
						
												 
						
							

								
									

										Name
										Label
										Description
										Caveats
										Units
										Default Value or Actual Value
										Valid Min
										Valid Max
									

								
								
								
								

									f10.7
									f10.7
									
Solar irradiation index as represented by the flux of 10.7 cm (2800 MHz) radiation from the Sun measured in units of 10−22 W⋅m−2⋅Hz−1. 

									Daily index of solar radiation that affects the daytime background conductivity in the ionosphere.
									sfu
									150
									50
									300
									
								

								
								

									iono_conductance
									iono_conductance
									
Parameter indicationg selection of conductance model in the ionosphere electrodynamics component of the model.

									The two models offered for run-on-request are constant (user sets Pedersen Conductance and Hall Conductance) and auroral (conducances driven by f10.7 and field-aligned currents from magnetosphere part of the model).
									
									auroral
									constant
									auroral
									
								

								
								

									Pedersen Conductance
									Pedersen Conductance
									
Value of constant user-selected Pedersen Conductance in the ionosphere.

									
									S
									5
									1
									100
									
								

								
								

									Hall Conductance
									Hall Conductance
									
Value of constant user-selected Hall Conductance in the ionosphere.

									
									S
									0
									0
									100
									
								

								
								
							

						
						
						
					

				
					

						Magnetosphere model parameters
						

						
						
						
												 
						
							

								
									

										Name
										Label
										Description
										Caveats
										Units
										Default Value or Actual Value
										Valid Min
										Valid Max
									

								
								
								
								

									grid
									grid
									
Grid definition referred to by number of cells.
The grids for the different global magnetosphere models are listed in a file GM_grids.txt.

									The design of SWMF grids is limitless and cannot be represented adequately with a single parameter. 
									
									high-resolution grid with 1,958,688 cells
									overwiew grid with 755136 cells
									1/8 R_E resolution dayside grid with 18,558,976 cells
									
								

								
								

									GM_boris_clight_factor
									GM_boris_clight_factor
									
The Boris factor reduces the speed of light in a MHD equations, thus reducing the numerical stiffness and allowing explicit time steps to be longer.

									The light speed is the largest wave speed in the numerical system. Wave phenomena might be lost with a light speed that is too low.
									
									0.01
									0.005
									1.0
									
								

								
								

									GM_resistivity_model
									GM_resistivity_model
									
Type of magnetosphere resistivity model applied. This can be anomalous resistivity driven by electric currents, constant resistivity or hyper-diffusion (artificial resistivity triggered by grid-scale gradients).

									A non-zero resistivity is applied only outside of 2 near-Earth boundary radii. 
									
									none
									
									
									
								

								
								

									GM_resistivity_value
									GM_resistivity_value
									
Value of constant resistivity in magnetosphere.

									
									m^2/s
									0
									0
									1.0E13
									
								

								
								

									GM_anomalous_resistivity_value
									GM_anomalous_resistivity_value
									
Resisitivty factor in anomalous 9current-driven)resistivity model.
resistivity = GM_resistivity_value + GM_anomalous_resistivity_value*(J-GM_resistivity_current_threshold)^2

									
									m^2/s
									0
									0
									1e15
									
								

								
								

									GM_resistivity_current_threshold
									GM_resistivity_current_threshold
									
Current value above which anomalous resistivity begins.

									
									muA/m^2
									0.7
									0
									10
									
								

								
								

									GM_anomalous_resistivity_max_value
									GM_anomalous_resistivity_max_value
									
Maximum value attained by anomalous resistivity model. Resistivity in thin current sheets with large current densities cannot exceed this value.

									
									m^2/s
									0
									0
									1e15
									
								

								
								

									inflow boundary
									inflow boundary
									
Location of sun-ward facing (front) boundary of the magnetosphere simulation box.

									
									R_E
									30
									24
									128
									
								

								
								
							

						
						
						
					

				
					

						Model outputs
						
Parameters that define the type of outputs generated and the frequency of outputs.

						
						
						
												 
						
							

								
									

										Name
										Label
										Description
										Caveats
										Units
										Default Value or Actual Value
										Valid Min
										Valid Max
									

								
								
								
								

									output_time_interval
									output_time_interval
									
Time interval between outputs in the magnetosphere and ionosphere electrodynamics.

									Other components within a global magnetosphere modeling framework such as ring current or thermosphere model may have their own time scales. Output cadences may differ.
									s
									240
									60
									1800
									
								

								
								

									satellite_output_time_interval
									satellite_output_time_interval
									
Time interval between outputs during satellite tracking in the magnetosphere (or inner mangetosphere) model.

									
									s
									5
									1
									60
									
								

								
								

									SSCWeb_satellite_names
									SSCWeb_satellite_names
									
Comma-separated list of satellite names (single-word strings used in SSCweb).

									Satellite trajectories are obtained from SSCweb's Locator Tabular interface and are typically limited to missions in geospace.
									
									none
									
									all satellites in SSCweb that are aloft at any time during a model run's time interval
									
								

								
								
							

						
						
						
					

				
			
		

	

	

		Run Access Information
		
		:
	

	
	
	

		Keyword(s)
		
		:
	

	
	
	

		Linked to Parent Spase Resource(s) (example: SimulationModel)
		
		:
	

	
	
	
	

		List of Publications Referencing this Run  
		
		:
	

	
	


        		
    

    

        
            




CMR Footer





 



Curator: Chiu Wiegand |
NASA Official: Dr. Masha Kuznetsova |
Privacy and Security Notices |
Accessibility |
CCMC Data Collection Consent Agreement